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B站稍后再看功能增强

B站稍后再看功能增强,目前功能包括UI增强、稍后再看模式自动切换至普通模式播放(重定向)、稍后再看移除记录等,支持功能设置

目前为 2020-07-18 提交的版本,查看 最新版本

// ==UserScript==
// @id              BilibiliWatchlaterPlus@Laster2800
// @name            B站稍后再看功能增强
// @version         2.9.1.20200719
// @namespace       laster2800
// @author          Laster2800
// @description     B站稍后再看功能增强,目前功能包括UI增强、稍后再看模式自动切换至普通模式播放(重定向)、稍后再看移除记录等,支持功能设置
// @homepage        http://greasyfork.icu/zh-CN/scripts/395456
// @supportURL      http://greasyfork.icu/zh-CN/scripts/395456/feedback
// @include         *://www.bilibili.com/*
// @include         *://message.bilibili.com/*
// @include         *://search.bilibili.com/*
// @include         *://space.bilibili.com/*
// @include         *://t.bilibili.com/*
// @include         *://account.bilibili.com/*
// @exclude         *://message.bilibili.com/pages/*
// @exclude         *://t.bilibili.com/h5/dynamic/specification
// @grant           GM_addStyle
// @grant           GM_xmlhttpRequest
// @grant           GM_registerMenuCommand
// @grant           GM_setValue
// @grant           GM_getValue
// @grant           GM_deleteValue
// @grant           GM_listValues
// @connect         api.bilibili.com
// @run-at          document-start
// ==/UserScript==

(function() {
  'use strict'
  // 全局对象
  var gm = {
    id: 'gm395456',
    configVersion: GM_getValue('configVersion'), // 配置版本,为执行初始化的代码版本对应的配置版本号
    configUpdate: 20200718, // 当前版本对应的配置版本号;若同一天修改多次,可以追加小数来区分
    config: {
      redirect: false,
    },
  }

  initAtDocumentStart()
  if (urlMatch(/bilibili.com\/medialist\/play\/watchlater(?=\/|$)/)) {
    if (gm.config.redirect) { // 重定向,document-start 就执行,尽可能快地将原页面掩盖过去
      fnRedirect()
      return // 必须 return,否则后面的内容还会执行使得加载速度超极慢
    }
  }

  // 脚本的其他部分推迟至 DOMContentLoaded 执行
  document.addEventListener('DOMContentLoaded', () => {
    init()
    updateVersion()
    readConfig()
    addScriptMenu()
    // 所有页面
    if (gm.config.headerButton) {
      fnHeaderButton()
    }
    if (urlMatch(gm.regex.page_watchlaterList)) {
      // 列表页面
      fnOpenListVideo()
      createWatchlaterListUI()
      if (gm.config.removeHistory) {
        saveWatchlaterListData()
      }
    } else if (urlMatch(gm.regex.page_videoNormalMode)) {
      // 播放页面(正常模式)
      if (gm.config.videoButton) {
        fnVideoButton_Normal()
      }
    } else if (urlMatch(gm.regex.page_videoWatchlaterMode)) {
      // 播放页面(稍后再看模式)
      if (gm.config.videoButton) {
        fnVideoButton_Watchlater()
      }
    }
    addStyle()

    /* END OF PROC, BEGIN OF FUNCTION */

    /** 初始化 */
    function init() {
      gm.url = {
        api_queryWatchlaterList: 'https://api.bilibili.com/x/v2/history/toview/web?jsonp=jsonp',
        api_addToWatchlater: 'https://api.bilibili.com/x/v2/history/toview/add',
        api_removeFromWatchlater: 'https://api.bilibili.com/x/v2/history/toview/del',
        page_watchlaterList: 'https://www.bilibili.com/watchlater/#/list',
        page_videoNormalMode: 'https://www.bilibili.com/video',
        page_videoWatchlaterMode: 'https://www.bilibili.com/medialist/play/watchlater',
        page_watchlaterPlayAll: 'https://www.bilibili.com/medialist/play/watchlater/p1',
        noop: 'javascript:void(0)',
      }

      gm.regex = {
        page_videoNormalMode: /bilibili.com\/video(|\/.*)$/,
        page_videoWatchlaterMode: /bilibili.com\/medialist\/play\/watchlater(?=\/|$)/,
        page_watchlaterList: /bilibili.com\/watchlater\/.*#.*\/list/,
      }

      gm.const = {
        // 移除记录保存相关
        rhsMin: 1,
        rhsMax: 1024, // 经过性能测试,放宽到 1024 应该没有太大问题
        rhsWarning: 256,
        // 渐变时间
        fadeTime: 400,
        textFadeTime: 100,
        // 信息框
        messageTime: 1200,
        messageTop: '70%',
        messageLeft: '50%',
      }

      gm.config = {
        ...gm.config,
        headerButton: true,
        openHeaderDropdownLink: 'ohdl_openInCurrent',
        headerButtonOpL: 'op_openListInCurrent',
        headerButtonOpR: 'op_openUserSetting',
        videoButton: true,
        openListVideo: 'olv_openInCurrent',
        removeHistory: true,
        removeHistorySaves: 64, // 就目前的PC运算力,即使达到 gm.const.rhsWarning 且在极限情况下也不会有明显的卡顿
        removeHistorySearchTimes: 8,
        removeHistoryData: null, // 特殊处理
        resetAfterFnUpdate: false,
        reloadAfterSetting: true,
      }

      gm.menu = {
        // key: { state, el, openHandler, closeHandler }
        setting: { state: false },
        history: { state: false },
      }

      gm.el = {
        gmRoot: document.body.appendChild(document.createElement('div')),
        setting: null,
        history: null,
      }
      gm.el.gmRoot.id = gm.id
    }

    /** 版本更新处理 */
    function updateVersion() {
      // 该项与更新相关,在此处处理
      gm.config.resetAfterFnUpdate = gmValidate('resetAfterFnUpdate', gm.config.resetAfterFnUpdate)

      if (gm.configVersion !== 0 && gm.configVersion !== gm.configUpdate) {
        if (gm.config.resetAfterFnUpdate) {
          gm.configVersion = 0
          return
        }

        if (gm.configVersion < gm.configUpdate) {
          if (gm.configVersion < 20200718) {
            // 2.8.0.20200718
            // 强制设置为新的默认值
            GM_setValue('removeHistorySaves', gm.config.removeHistorySaves)
            var removeHistory = GM_getValue('removeHistory')
            if (removeHistory) {
              // 修改容量
              var removeHistoryData = GM_getValue('removeHistoryData')
              if (removeHistoryData) {
                Object.setPrototypeOf(removeHistoryData, PushQueue.prototype)
                removeHistoryData.setCapacity(gm.const.rhsMax)
                GM_setValue('removeHistoryData', removeHistoryData)
              }
            } else {
              // 如果 removeHistory 关闭则移除 removeHistoryData
              GM_setValue('removeHistoryData', null)
            }
            // 升级配置版本
            gm.configVersion = gm.configUpdate
            GM_setValue('configVersion', gm.configVersion)
          }
        } else if (gm.configVersion === undefined) {
          if (GM_getValue('gm395456') > 0) {
            // 2.6.0.20200717 版本重构
            for (var name in gm.config) {
              var oldName = 'gm395456_' + name
              var value = GM_getValue(oldName)
              GM_setValue(name, value)
              GM_deleteValue(oldName)
            }
            gm.configVersion = GM_getValue('gm395456')
            GM_setValue('configVersion', gm.configVersion) // 保留配置版本
            GM_deleteValue('gm395456')
          }
        }
      }
    }

    /** 用户配置读取 */
    function readConfig() {
      var cfgDocumentStart = { redirect: true } // document-start 时期就处理过的配置
      var cfgManual = { removeHistoryData: true, resetAfterFnUpdate: true } // 手动处理的配置
      if (gm.configVersion > 0) {
        // 对配置进行校验
        var cfgNoWriteBack = { removeHistorySearchTimes: true } // 不进行回写的配置
        for (var name in gm.config) {
          if (!cfgDocumentStart[name] && !cfgManual[name]) {
            gm.config[name] = gmValidate(name, gm.config[name], !cfgNoWriteBack[name])
          }
        }
        // 特殊处理
        if (gm.config.removeHistorySearchTimes > gm.config.removeHistorySaves) {
          gm.config.removeHistorySearchTimes = gm.config.removeHistorySaves
          GM_setValue('removeHistorySearchTimes', gm.config.removeHistorySearchTimes)
        }
        // 处理 removeHistoryData
        if (gm.config.removeHistory) {
          gm.config.removeHistoryData = gmValidate('removeHistoryData', null, false)
          if (gm.config.removeHistoryData) {
            Object.setPrototypeOf(gm.config.removeHistoryData, PushQueue.prototype) // 还原类型信息
            if (gm.config.removeHistoryData.maxSize != gm.config.removeHistorySaves) {
              gm.config.removeHistoryData.setMaxSize(gm.config.removeHistorySaves)
            }
          } else {
            gm.config.removeHistoryData = new PushQueue(gm.config.removeHistorySaves, gm.const.rhsMax)
            GM_setValue('removeHistoryData', gm.config.removeHistoryData)
          }
        }
      } else {
        // 用户强制初始化,或者第一次安装脚本
        gm.configVersion = 0
        if (gm.config.removeHistory) {
          gm.config.removeHistoryData = new PushQueue(gm.config.removeHistorySaves, gm.const.rhsMax)
          GM_setValue('removeHistoryData', gm.config.removeHistoryData)
        }
        for (name in gm.config) {
          if (!cfgDocumentStart[name] && !cfgManual[name]) {
            GM_setValue(name, gm.config[name])
          }
        }
      }
    }

    /** 添加脚本菜单 */
    function addScriptMenu() {
      // 用户配置设置
      GM_registerMenuCommand('用户设置', openUserSetting)
      if (!gm.configVersion) { // 初始化
        openUserSetting(true)
      }
      // 稍后再看移除记录
      if (gm.config.removeHistory) {
        GM_registerMenuCommand('显示稍后再看移除记录', openRemoveHistory)
      }
      // 强制初始化
      GM_registerMenuCommand('重置脚本数据', resetScript)
    }

    /** 顶栏中加入稍后再看入口 */
    function fnHeaderButton() {
      executeAfterElementLoad({
        selector: '.user-con.signin',
        callback: header => {
          if (header) {
            var collect = header.children[4]
            var watchlater = header.children[6].cloneNode(true)
            var link = watchlater.firstChild
            var text = link.firstChild
            text.innerText = '稍后再看'
            header.insertBefore(watchlater, collect)

            executeLeftClick(link)
            executeRightClick(watchlater)
            executeTooltip(collect, watchlater)
          }
        },
      })

      /** 处理鼠标左键点击 */
      var executeLeftClick = link => {
        // 使用 href 和 target 的方式设置,保留浏览器中键强制新标签页打开的特性
        var left = getHrefAndTarget(gm.config.headerButtonOpL)
        link.href = left.href
        link.target = left.target
        switch (gm.config.headerButtonOpL) {
          case 'op_openUserSetting':
            link.onclick = () => openUserSetting()
            break
          case 'op_openRemoveHistory':
            link.onclick = () => openRemoveHistory()
            break
        }
      }

      /** 处理鼠标右键点击 */
      var executeRightClick = watchlater => {
        watchlater.oncontextmenu = function(e) {
          if (gm.config.headerButtonOpR != 'op_noOperation') {
            e && e.preventDefault && e.preventDefault()
          }
          switch (gm.config.headerButtonOpR) {
            case 'op_openListInCurrent':
            case 'op_openListInNew':
            case 'op_playAllInCurrent':
            case 'op_playAllInNew':
              var right = getHrefAndTarget(gm.config.headerButtonOpR)
              window.open(right.href, right.target)
              break
            case 'op_openUserSetting':
              openUserSetting()
              break
            case 'op_openRemoveHistory':
              openRemoveHistory()
              break
          }
        }
      }

      /** 处理弹出菜单 */
      function executeTooltip(collect, watchlater) {
        // 鼠标移动到稍后再看入口上时,以 Tooltip 形式显示稍后再看列表
        var watchlaterPanelSelector = '[role=tooltip][aria-hidden=false] .tabs-panel [title=稍后再看]'
        var dispVue = collect.firstChild.__vue__
        watchlater.onmouseover = () => {
          // 确保原列表完全消失后再显示,避免从“收藏”移动到稍后再看时列表反而消失的问题
          executeAfterConditionPass({
            condition: () => !document.querySelector(watchlaterPanelSelector),
            callback: () => {
              dispVue.showPopper = true
              executeAfterElementLoad({
                selector: watchlaterPanelSelector,
                callback: watchlaterPanel => {
                  watchlaterPanel.parentNode.addEventListener('click', () => {
                    setTimeout(() => {
                      var target = gm.config.openHeaderDropdownLink == 'ohdl_openInNew' ? '_blank' : '_self'
                      var links = document.querySelectorAll('[role=tooltip][aria-hidden=false] .favorite-video-panel a')
                      for (var link of links) {
                        link.target = target
                      }
                    }, 200)
                  })
                  watchlaterPanel.parentNode.click()
                },
                interval: 50,
                timeout: 1500,
              })
            },
            interval: 10,
            timeout: 500,
          })
        }
        // 鼠标从“稍后再看”离开时关闭列表,但移动到“收藏”上面时不关闭
        collect.onmouseover = () => {
          collect.mouseOver = true
        }
        collect.onmouseleave = () => {
          collect.mouseOver = false
        }
        watchlater.onmouseleave = () => {
          // 要留出足够空间让 collect.mouseOver 变化
          // 但有时候还是会闪,毕竟常规方式估计是无法阻止鼠标移动到“收藏”上时的 Vue 事件
          setTimeout(() => {
            if (!collect.mouseOver) {
              dispVue.showPopper = false
            }
          }, 100)
        }
      }

      function getHrefAndTarget(op) {
        var href = ''
        if (/openList/i.test(op)) {
          href = gm.url.page_watchlaterList
        } else if (/playAll/.test(op)) {
          href = gm.url.page_watchlaterPlayAll
        } else {
          href = gm.url.noop
        }
        var target = ''
        if (/inCurrent/i.test(op)) {
          target = '_self'
        } else if (/inNew/i.test(op)) {
          target = '_blank'
        } else {
          target = '_self'
        }
        return { href, target }
      }
    }

    /** 常规播放页加入快速切换稍后再看状态的按钮 */
    function fnVideoButton_Normal() {
      /** 继续执行的条件 */
      var executeCondition = () => {
        // 必须在确定 Vue 加载完成后再修改 DOM 结构,否则会导致 Vue 加载出错造成页面错误
        var app = document.querySelector('#app')
        var vueLoad = app && app.__vue__
        if (!vueLoad) {
          return false
        }
        var atr = document.querySelector('#arc_toolbar_report')
        var original = atr && atr.querySelector('.van-watchlater')
        if (original && original.__vue__) {
          return [atr, original]
        } else {
          return false
        }
      }

      executeAfterConditionPass({
        condition: executeCondition,
        callback: ([atr, original]) => {
          var oVue = original.__vue__
          var btn = document.createElement('label')
          btn.id = `${gm.id}-normal-video-btn`
          var cb = document.createElement('input')
          cb.type = 'checkbox'
          btn.appendChild(cb)
          var text = document.createElement('span')
          text.innerText = '稍后再看'
          btn.className = 'appeal-text'
          cb.onclick = () => { // 不要附加到 btn 上,否则点击时会执行两次
            oVue.handler()
            var checked = !oVue.added
            // 检测操作是否生效,失败时弹出提示
            executeAfterConditionPass({
              condition: () => checked === oVue.added,
              callback: () => { cb.checked = checked },
              interval: 50,
              timeout: 500,
              onTimeout: () => {
                cb.checked = oVue.added
                message(checked ? '添加至稍后再看失败' : '从稍后再看移除失败')
              },
            })
          }
          btn.appendChild(text)
          atr.appendChild(btn)
          original.parentNode.style.display = 'none'
          setButtonStatus(oVue, cb)
        },
      })

      /** 设置按钮的稍后再看状态 */
      var setButtonStatus = async (oVue, cb) => {
        var aid = oVue.aid // also unsafeWindow.aid
        var status = await getVideoWatchlaterStatusByAid(aid)
        oVue.added = status
        cb.checked = status
      }
    }

    /** 稍后再看播放页加入快速切换稍后再看状态的按钮 */
    function fnVideoButton_Watchlater() {
      var aidMap = new Map()

      /** 继续执行的条件 */
      var executeCondition = () => {
        // 必须在确定 Vue 加载完成后再修改 DOM 结构,否则会导致 Vue 加载出错造成页面错误
        var app = document.querySelector('#app')
        var vueLoad = app && app.__vue__
        if (!vueLoad) {
          return false
        }
        return app.querySelector('#playContainer .left-container .play-options .play-options-more')
      }

      executeAfterConditionPass({
        condition: executeCondition,
        callback: more => {
          var btn = document.createElement('label')
          btn.id = `${gm.id}-watchlater-video-btn`
          btn.onclick = e => e.stopPropagation()
          var cb = document.createElement('input')
          cb.type = 'checkbox'
          btn.appendChild(cb)
          var text = document.createElement('span')
          text.innerText = '稍后再看'
          btn.appendChild(text)
          more.appendChild(btn)

          btn.added = true
          cb.checked = true // 第一次打开时,默认在稍后再看中
          var csrf = getCsrf()
          cb.onclick = () => executeSwitch({ btn, cb, csrf })

          // 切换视频时的处理
          createLocationchangeEvent()
          window.addEventListener('locationchange', async function() {
            if (!btn.aid) {
              btn.aid = await getAid()
            }
            executeAfterConditionPass({
              condition: () => {
                var aid = unsafeWindow.aid // 切换之后必然会有 unsafeWindow.aid
                if (aid && aid != btn.aid) {
                  return aid
                }
              },
              callback: async aid => {
                btn.aid = aid
                var status = await getVideoWatchlaterStatusByAid(btn.aid)
                btn.added = status
                cb.checked = status
              }
            })
          })
        },
      })

      /**
       * 处理视频状态的切换
       */
      var executeSwitch = async ({ btn, cb, csrf }) => { // 不要附加到 btn 上,否则点击时会执行两次
        btn.aid = await getAid()
        if (!btn.aid) {
          cb.checked = btn.added
          message('网络错误,操作失败')
          return
        }
        var data = new FormData()
        data.append('aid', btn.aid)
        data.append('csrf', csrf)
        GM_xmlhttpRequest({
          method: 'POST',
          url: btn.added ? gm.url.api_removeFromWatchlater : gm.url.api_addToWatchlater,
          data: data,
          onload: function(response) {
            try {
              var note = btn.added ? '从稍后再看移除' : '添加到稍后再看'
              if (JSON.parse(response.response).code == 0) {
                btn.added = !btn.added
                cb.checked = btn.added
                message(note + '成功')
              } else {
                cb.checked = btn.added
                message(`网络错误,${note}失败`)
              }
            } catch (e) {
              console.error(`网络连接错误,重置脚本数据也许能解决问题。无法解决请联系脚本作者:${GM_info.script.supportURL}`)
              console.error(e)
            }
          }
        })
      }

      /** 获取 CSRF */
      var getCsrf = () => {
        var cookies = document.cookie.split('; ')
        cookies = cookies.reduce((prev, val) => {
          var parts = val.split('=')
          var key = parts[0]
          var value = parts[1]
          prev[key] = value
          return prev
        }, {})
        var csrf = cookies.bili_jct
        return csrf
      }

      /** 获取当前页面对应的 aid */
      var getAid = async () => {
        var aid = unsafeWindow.aid // 第一次打开播放页时不存在,但切换视频后就存在了
        if (aid) {
          return aid
        }

        var bvid = await getBvid()
        aid = aidMap.get(bvid)
        if (aid) {
          return aid
        }

        // 用笨方法查算了,那套算法太烦,不想弄过来
        // 这里不能根据分P来推测 aid,因为该功能的引入,分P不一定对得上真正的列表
        return new Promise(resolve => {
          GM_xmlhttpRequest({
            method: 'GET',
            url: gm.url.api_queryWatchlaterList,
            onload: function(response) {
              try {
                var json = JSON.parse(response.responseText)
                var watchlaterList = json.data.list
                var aid = null
                for (var e of watchlaterList) {
                  if (bvid == e.bvid) {
                    aid = e.aid
                    break
                  }
                }
                if (aid) {
                  aidMap.set(bvid, aid)
                }
                resolve(aid)
              } catch (e) {
                console.error(`网络连接错误,重置脚本数据也许能解决问题。无法解决请联系脚本作者:${GM_info.script.supportURL}`)
                console.error(e)
              }
            },
          })
        })
      }

      /** 获取当前页面的 bvid */
      var getBvid = async () => {
        return new Promise(resolve => {
          executeAfterConditionPass({
            condition: () => {
              try {
                var url = document.querySelector('.play-title-location').href
                var m = url.match(/(?<=\/)BV[a-zA-Z\d]+(?=\/|$)/)
                if (m && m[0]) {
                  return m[0]
                }
              } catch (e) {
                // ignore
              }
            },
            callback: bvid => resolve(bvid)
          })
        })
      }

      /**
       * 创建 locationchange 事件
       *
       * @see https://stackoverflow.com/a/52809105
       */
      var createLocationchangeEvent = () => {
        if (!unsafeWindow._createLocationchangeEvent) {
          history.pushState = (f => function pushState() {
            var ret = f.apply(this, arguments)
            window.dispatchEvent(new Event('pushstate'))
            window.dispatchEvent(new Event('locationchange'))
            return ret
          })(history.pushState)
          history.replaceState = (f => function replaceState() {
            var ret = f.apply(this, arguments)
            window.dispatchEvent(new Event('replacestate'))
            window.dispatchEvent(new Event('locationchange'))
            return ret
          })(history.replaceState)
          window.addEventListener('popstate', () => {
            window.dispatchEvent(new Event('locationchange'))
          })
          unsafeWindow._createLocationchangeEvent = true
        }
      }
    }

    /**
     * 根据 aid 获取视频的稍后再看状态
     *
     * @param {string | number} aid AV号
     * @returns {Promise<boolean>} 视频是否在稍后再看中
     */
    async function getVideoWatchlaterStatusByAid(aid) {
      // oVue.added 第一次取到的值总是 false,从页面无法获取到该视频是否已经在稍后再看列表中,需要使用API查询
      return new Promise(resolve => {
        GM_xmlhttpRequest({
          method: 'GET',
          url: gm.url.api_queryWatchlaterList,
          onload: function(response) {
            if (response && response.responseText) {
              try {
                var json = JSON.parse(response.responseText)
                var watchlaterList = json.data.list
                for (var e of watchlaterList) {
                  if (aid == e.aid) {
                    resolve(true)
                    return
                  }
                }
                resolve(false)
              } catch (e) {
                console.error(e)
              }
            }
          }
        })
      })
    }

    /** 处理列表页面点击视频时的行为 */
    function fnOpenListVideo() {
      if (gm.config.openListVideo == 'olv_openInNew') {
        // 如果列表页面在新标签页打开视频
        var base = document.head.appendChild(document.createElement('base'))
        base.id = 'gm-base'
        base.target = '_blank'
      }
    }

    /** 保存列表页面数据,用于生成移除记录 */
    function saveWatchlaterListData() {
      GM_xmlhttpRequest({
        method: 'GET',
        url: gm.url.api_queryWatchlaterList,
        onload: function(response) {
          if (response && response.responseText) {
            var current = []
            try {
              var json = JSON.parse(response.responseText)
              var watchlaterList = json.data.list
              for (var e of watchlaterList) {
                current.push({
                  title: e.title,
                  bvid: e.bvid,
                })
              }
              gm.config.removeHistoryData.push(current)
              GM_setValue('removeHistoryData', gm.config.removeHistoryData)
            } catch (e) {
              console.error(`保存稍后再看列表错误,重置脚本数据也许能解决问题。无法解决请联系脚本作者:${GM_info.script.supportURL}`)
              console.error(e)
            }
          }
        }
      })
    }

    /** 生成列表页面的 UI */
    function createWatchlaterListUI() {
      var r_con = document.querySelector('.watch-later-list.bili-wrapper header .r-con')
      if (gm.config.removeHistory) {
        // 在列表页面加入“移除记录”
        var removeHistoryButton = r_con.appendChild(document.createElement('div'))
        removeHistoryButton.innerText = '移除记录'
        removeHistoryButton.className = 's-btn'
        removeHistoryButton.onclick = () => openRemoveHistory() // 要避免 MouseEvent 的传递
      }
      // 在列表页面加如“增强设置”
      var plusButton = r_con.appendChild(document.createElement('div'))
      plusButton.innerText = '增强设置'
      plusButton.className = 's-btn'
      plusButton.onclick = () => openUserSetting() // 要避免 MouseEvent 的传递
    }

    /**
     * 打开用户设置
     *
     * @param {boolean} initial 是否进行初始化设置
     */
    function openUserSetting(initial) {
      if (gm.el.setting) {
        openMenuItem('setting')
      } else {
        var el = {}
        var configMap = {
          // { attr, manual, needNotReload }
          headerButton: { attr: 'checked' },
          openHeaderDropdownLink: { attr: 'value' },
          headerButtonOpL: { attr: 'value' },
          headerButtonOpR: { attr: 'value' },
          videoButton: { attr: 'checked' },
          redirect: { attr: 'checked' },
          openListVideo: { attr: 'value' },
          removeHistory: { attr: 'checked', manual: true },
          removeHistorySaves: { attr: 'value', manual: true, needNotReload: true },
          removeHistorySearchTimes: { attr: 'value', manual: true, needNotReload: true },
          resetAfterFnUpdate: { attr: 'checked' },
          reloadAfterSetting: { attr: 'checked', needNotReload: true },
        }
        setTimeout(() => {
          initSetting()
          handleConfigItem()
          handleSettingItem()
          openMenuItem('setting')
        })

        /** 设置页面初始化 */
        var initSetting = () => {
          gm.el.setting = gm.el.gmRoot.appendChild(document.createElement('div'))
          gm.menu.setting.el = gm.el.setting
          gm.el.setting.className = 'gm-setting'
          gm.el.setting.innerHTML = `
<div class="gm-setting-page">
    <div class="gm-title">
        <div id="gm-maintitle" onclick="window.open('${GM_info.script.homepage}')" title="${GM_info.script.homepage}">B站稍后再看功能增强</div>
        <div class="gm-subtitle">V${GM_info.script.version} by ${GM_info.script.author}</div>
    </div>
    <div class="gm-items">
        <div class="gm-item">
            <label title="在顶栏“动态”和“收藏”之间加入稍后再看入口,鼠标移至上方时弹出列表菜单,支持点击功能设置">
                <span>【所有页面】在顶栏中加入稍后再看入口</span><input id="gm-headerButton" type="checkbox"></label>
            <div class="gm-subitem" title="选择在下拉菜单中点击视频的行为">
                <span>在下拉菜单中点击视频时</span>
                <select id="gm-openHeaderDropdownLink">
                    <option value="ohdl_openInCurrent">在当前页面打开</option>
                    <option value="ohdl_openInNew">在新标签页打开</option>
                </select>
            </div>
            <div class="gm-subitem" title="选择左键点击入口时执行的操作">
                <span>在入口上点击鼠标左键时</span>
                <select id="gm-headerButtonOpL"></select>
            </div>
            <div class="gm-subitem" title="选择右键点击入口时执行的操作">
                <span>在入口上点击鼠标右键时</span>
                <select id="gm-headerButtonOpR"></select>
            </div>
        </div>
        <label class="gm-item" title="在播放页面(包括普通模式和稍后再看模式)中加入能将视频快速切换添加或移除出稍后再看列表的按钮">
            <span>【播放页面】加入快速切换视频稍后再看状态的按钮</span><input id="gm-videoButton" type="checkbox"></label>
        <label class="gm-item" title="打开【${gm.url.page_videoWatchlaterMode}】页面时,自动切换至【${gm.url.page_videoNormalMode}】页面进行播放">
            <span>【播放页面】从稍后再看模式切换到普通模式播放</span><input id="gm-redirect" type="checkbox"></label>
        <label class="gm-item" title="设置在【${gm.url.page_watchlaterList}】页面点击视频时的行为">
            <span>【列表页面】点击视频时</span>
            <select id="gm-openListVideo">
                <option value="olv_openInCurrent">在当前页面打开</option>
                <option value="olv_openInNew">在新标签页打开</option>
            </select>
        </label>
        <div class="gm-item">
            <label title="保留最近几次打开【${gm.url.page_watchlaterList}】页面时稍后再看列表的记录,以查找出这段时间内将哪些视频移除出稍后再看,用于防止误删操作。关闭该选项后,会将内部历史数据清除!">
                <span>【列表页面】开启稍后再看移除记录(防误删)</span>
                <input id="gm-removeHistory" type="checkbox">
                <span id="gm-rhWarning" class="gm-warning">⚠</span>
            </label>
            <div class="gm-subitem" title="较大的数值可能会带来较大的开销,经过性能测试,作者认为在设置在${gm.const.rhsWarning}以下时,即使在极限情况下也不会产生让人能察觉到的卡顿(存取总时不超过100ms),但在没有特殊要求的情况下依然不建议设置到这么大。该项修改后,会立即对过期记录进行清理,重新修改为原来的值无法还原被清除的记录,设置为比原来小的值需慎重!(范围:${gm.const.rhsMin} ~ ${gm.const.rhsMax})">
                <span>保存最近多少次列表页面数据用于生成移除记录</span>
                <input id="gm-removeHistorySaves" type="text">
                <span id="gm-rhsWarning" class="gm-warning">⚠</span>
            </div>
            <div class="gm-subitem" title="搜寻时在最近多少次列表页面数据中查找,设置较小的值能较好地定位最近移除的视频。设置较大的值几乎不会对性能造成影响,但不能大于最近列表页面数据保存次数。">
                <span>默认历史回溯深度</span><input id="gm-removeHistorySearchTimes" type="text"></div>
        </div>
        <label class="gm-item" title="功能性更新后,是否强制进行初始化设置?特别地,该选项的设置在初始化设置时将被保留,但重置脚本数据时依然会被重置。">
            <span>【用户设置】功能性更新后进行初始化设置</span><input id="gm-resetAfterFnUpdate" type="checkbox"></label>
        <label class="gm-item" title="勾选后,如果更改的配置需要重新加载才能生效,那么会在设置完成后重新加载页面。">
            <span>【用户设置】必要时在设置完成后重新加载页面</span><input id="gm-reloadAfterSetting" type="checkbox"></label>
    </div>
    <div class="gm-bottom">
        <button id="gm-save">保存</button><button id="gm-cancel">取消</button>
    </div>
    <div id="gm-reset" title="重置脚本设置及内部数据,也许能解决脚本运行错误的问题。无法解决请联系脚本作者:${GM_info.script.supportURL}">重置脚本数据</div>
</div>
<div class="gm-shadow"></div>
`

          // 找出配置对应的元素
          for (var name in gm.config) {
            el[name] = gm.el.setting.querySelector('#gm-' + name)
          }

          el.save = gm.el.setting.querySelector('#gm-save')
          el.cancel = gm.el.setting.querySelector('#gm-cancel')
          el.shadow = gm.el.setting.querySelector('.gm-shadow')
          el.reset = gm.el.setting.querySelector('#gm-reset')
          el.reset.onclick = resetScript

          el.rhWarning = gm.el.setting.querySelector('#gm-rhWarning')
          initWarning(el.rhWarning, '关闭移除记录,或将列表页面数据保存次数设置为比原来小的值,都会造成对内部过期历史数据的清理!')
          el.rhsWarning = gm.el.setting.querySelector('#gm-rhsWarning')
          initWarning(el.rhsWarning, `该项设置过大时,在极端情况下可能会产生明显的卡顿,一般不建议该项超过${gm.const.rhsWarning}。`)

          el.headerButtonOpL.innerHTML = el.headerButtonOpR.innerHTML = `
<option value="op_openListInCurrent">在当前页面打开列表页面</option>
<option value="op_openListInNew">在新标签页打开列表页面</option>
<option value="op_playAllInCurrent">在当前页面播放全部</option>
<option value="op_playAllInNew">在新标签页播放全部</option>
<option value="op_openUserSetting">打开用户设置</option>
<option value="op_openRemoveHistory">打开稍后再看移除记录</option>
<option value="op_noOperation">不执行操作</option>
        `
        }

        /** 维护与设置项相关的数据和元素 */
        var handleConfigItem = () => {
          // 子项与父项相关联
          var subitemChange = (item, subs) => {
            for (var el of subs) {
              var parent = el.parentElement
              if (item.checked) {
                parent.removeAttribute('disabled')
              } else {
                parent.setAttribute('disabled', 'disabled')
              }
              el.disabled = !item.checked
            }
          }
          el.headerButton.onchange = function() {
            subitemChange(this, [el.openHeaderDropdownLink, el.headerButtonOpL, el.headerButtonOpR])
          }
          el.removeHistory.onchange = function() {
            subitemChange(this, [el.removeHistorySaves, el.removeHistorySearchTimes])
            setRhWaring()
          }

          // 输入框内容处理
          el.removeHistorySaves.oninput = function() {
            var v0 = this.value.replace(/[^\d]/g, '')
            if (v0 === '') {
              this.value = ''
            } else {
              var value = parseInt(v0)
              if (value > gm.const.rhsMax) {
                value = gm.const.rhsMax
              } else if (value < gm.const.rhsMin) {
                value = gm.const.rhsMin
              }
              this.value = value
            }
            setRhWaring()
            setRhsWarning()
          }
          el.removeHistorySaves.onblur = function() {
            if (this.value === '') {
              this.value = el.removeHistorySearchTimes.value
            }
            if (parseInt(el.removeHistorySearchTimes.value) > parseInt(this.value)) {
              el.removeHistorySearchTimes.value = this.value
            }
            setRhWaring()
            setRhsWarning()
          }
          el.removeHistorySearchTimes.oninput = function() {
            var v0 = this.value.replace(/[^\d]/g, '')
            if (v0 === '') {
              this.value = ''
            } else {
              var value = parseInt(v0)
              if (value > gm.const.rhsMax) {
                value = gm.const.rhsMax
              } else if (value < gm.const.rhsMin) {
                value = gm.const.rhsMin
              }
              this.value = value
            }
          }
          el.removeHistorySearchTimes.onblur = function() {
            if (this.value === '') {
              this.value = el.removeHistorySaves.value
            } else if (parseInt(el.removeHistorySaves.value) < parseInt(this.value)) {
              el.removeHistorySaves.value = this.value
              setRhWaring()
              setRhsWarning()
            }
          }
        }

        /** 处理与设置页面相关的数据和元素 */
        var handleSettingItem = () => {
          el.save.onclick = onSave
          gm.menu.setting.openHandler = onOpen
          el.cancel.onclick = () => closeMenuItem('setting')
          el.shadow.onclick = function() {
            if (!this.getAttribute('disabled')) {
              closeMenuItem('setting')
            }
          }
          if (initial) {
            el.reset.style.display = 'none'
            el.cancel.disabled = true
            el.shadow.setAttribute('disabled', 'disabled')
          }
        }

        var needReload = false
        /** 设置保存时执行 */
        var onSave = () => {
          // 通用处理
          for (var name in configMap) {
            var cfg = configMap[name]
            if (!cfg.manual) {
              var change = saveConfig(name, cfg.attr)
              if (!cfg.needNotReload) {
                needReload = needReload || change
              }
            }
          }

          // 特殊处理
          var resetMaxSize = false
          // removeHistory
          if (gm.config.removeHistory != el.removeHistory.checked) {
            gm.config.removeHistory = el.removeHistory.checked
            GM_setValue('removeHistory', gm.config.removeHistory)
            resetMaxSize = true
            needReload = true
          }
          // “因”中无 removeHistory,就说明 needReload 需要设置为 true,除非“果”不需要刷新页面就能生效
          if (gm.config.removeHistory) {
            var rhsV = parseInt(el.removeHistorySaves.value)
            if (rhsV != gm.config.removeHistorySaves && !isNaN(rhsV)) {
              // 因:removeHistorySaves
              // 果:removeHistorySaves & removeHistoryData
              if (gm.config.removeHistoryData) {
                gm.config.removeHistoryData.setMaxSize(rhsV)
              } else {
                gm.config.removeHistoryData = new PushQueue(rhsV, gm.const.rhsMax)
              }
              gm.config.removeHistorySaves = rhsV
              GM_setValue('removeHistorySaves', gm.config.removeHistorySaves)
              GM_setValue('removeHistoryData', gm.config.removeHistoryData)
              // 不需要修改 needReload
            } else if (resetMaxSize) {
              // 因:removeHistory
              // 果:removeHistoryData
              if (gm.config.removeHistoryData) {
                gm.config.removeHistoryData.setMaxSize(rhsV)
              } else {
                gm.config.removeHistoryData = new PushQueue(rhsV, gm.const.rhsMax)
              }
              GM_setValue('removeHistoryData', gm.config.removeHistoryData)
            }
            // 因:removeHistorySearchTimes
            // 果:removeHistorySearchTimes
            var rhstV = parseInt(el.removeHistorySearchTimes.value)
            if (rhstV != gm.config.removeHistorySearchTimes && !isNaN(rhstV)) {
              gm.config.removeHistorySearchTimes = rhstV
              GM_setValue('removeHistorySearchTimes', gm.config.removeHistorySearchTimes)
              // 不需要修改 needReload
            }
          } else if (resetMaxSize) {
            // 因:removeHistory
            // 果:removeHistoryData
            if (gm.config.removeHistoryData) {
              gm.config.removeHistoryData = null
              GM_setValue('removeHistoryData', gm.config.removeHistoryData)
            }
          }

          closeMenuItem('setting')
          if (initial) {
            // 更新配置版本
            gm.configVersion = gm.configUpdate
            GM_setValue('configVersion', gm.configVersion)
            // 关闭初始化状态
            setTimeout(() => {
              el.reset.style.display = 'unset'
              el.cancel.disabled = false
              el.shadow.removeAttribute('disabled')
            }, gm.const.fadeTime)
          }

          if (gm.config.reloadAfterSetting && needReload) {
            needReload = false
            location.reload()
          }
        }

        /** 设置打开时执行 */
        var onOpen = () => {
          for (var name in configMap) {
            var attr = configMap[name].attr
            el[name][attr] = gm.config[name]
          }
          el.headerButton.onchange()
          el.removeHistory.onchange()
        }

        /**
         * 保存配置
         *
         * @param {string} name 配置名称
         * @param {string} attr 从对应元素的什么属性读取
         * @returns {boolean} 是否有实际更新
         */
        var saveConfig = (name, attr) => {
          var elValue = el[name][attr]
          if (gm.config[name] != elValue) {
            gm.config[name] = elValue
            GM_setValue(name, gm.config[name])
            return true
          }
          return false
        }

        /** 设置 removeHistory 警告项 */
        var setRhWaring = () => {
          var warn = false
          var rh = el.removeHistory.checked
          if (!rh) {
            warn = true
          } else {
            var rhs = parseInt(el.removeHistorySaves.value)
            if (isNaN(rhs)) {
              rhs = 0
            }
            if (rhs < gm.config.removeHistorySaves) {
              warn = true
            }
          }

          if (el.rhWarning.show) {
            if (!warn) {
              fade(false, el.rhWarning)
              el.rhWarning.show = false
            }
          } else {
            if (warn) {
              fade(true, el.rhWarning)
              el.rhWarning.show = true
            }
          }
        }

        /** 设置 removeHistorySaves 警告项 */
        var setRhsWarning = () => {
          var value = parseInt(el.removeHistorySaves.value)
          if (isNaN(value)) {
            value = 0
          }
          if (el.rhsWarning.show) {
            if (value <= gm.const.rhsWarning) {
              fade(false, el.rhsWarning)
              el.rhsWarning.show = false
            }
          } else {
            if (value > gm.const.rhsWarning) {
              fade(true, el.rhsWarning)
              el.rhsWarning.show = true
            }
          }
        }
      }

      /**
       * 设置警告项
       *
       * @param {HTMLElement} elWarning 警告元素
       * @param {string} msg 警告信息
       */
      var initWarning = (elWarning, msg) => {
        elWarning.show = false
        elWarning.onmouseover = function() {
          var htmlMsg = `
<table><tr>
    <td style="font-size:1.8em;line-height:1.8em;padding-right:0.6em;">⚠</td>
    <td>${msg}</td>
</tr></table>
`
          this.msgbox = message(htmlMsg, { html: true, autoClose: false })
        }
        elWarning.onmouseleave = function() {
          if (this.msgbox) {
            closeMessage(this.msgbox)
          }
        }
      }
    }

    /** 打开移除记录 */
    function openRemoveHistory() {
      if (!gm.config.removeHistory) {
        message('请在设置中开启稍后再看移除记录')
        return
      }

      var el = {}
      el.searchTimes = null
      if (gm.el.history) {
        el.searchTimes = gm.el.history.querySelector('#gm-search-times')
        el.searchTimes.current = gm.config.removeHistorySearchTimes < gm.config.removeHistoryData.size ? gm.config.removeHistorySearchTimes : gm.config.removeHistoryData.size
        el.searchTimes.value = el.searchTimes.current
        openMenuItem('history')
      } else {
        setTimeout(() => {
          historyInit()
          handleItem()
          openMenuItem('history')
        })

        /** 初始化移除记录页面 */
        var historyInit = () => {
          gm.el.history = gm.el.gmRoot.appendChild(document.createElement('div'))
          gm.menu.history.el = gm.el.history
          gm.el.history.className = 'gm-history'
          gm.el.history.innerHTML = `
<div class="gm-history-page">
    <div class="gm-title">稍后再看移除记录</div>
    <div class="gm-comment">
        <div>根据最近<span id="gm-save-times">X</span>次打开列表页面时获取到的<span id="gm-record-num">X</span>条记录生成,共筛选出<span id="gm-remove-num">X</span>条移除记录。排序由首次加入到稍后再看的顺序决定,与移除出稍后再看的时间无关。如果记录太多难以定位被误删的视频,请在下方设置减少历史回溯深度。鼠标移动到内容区域可向下滚动翻页,点击对话框以外的位置退出。</div>
        <div style="text-align:right;font-weight:bold;margin-right:1em" title="搜寻时在最近多少次列表页面数据中查找,设置较小的值能较好地定位最近移除的视频。按下回车键或输入框失去焦点时刷新数据。">历史回溯深度:<input type="text" id="gm-search-times" value="X"></div>
    </div>
</div>
<div class="gm-shadow"></div>
`
          el.historyPage = gm.el.history.querySelector('.gm-history-page')
          el.comment = gm.el.history.querySelector('.gm-comment')
          el.content = null
          el.saveTimes = gm.el.history.querySelector('#gm-save-times')
          el.recordNum = gm.el.history.querySelector('#gm-record-num')
          el.removeNum = gm.el.history.querySelector('#gm-remove-num')
          el.shadow = gm.el.history.querySelector('.gm-shadow')
        }

        /** 维护内部元素和数据 */
        var handleItem = () => {
          // 使用 el.searchTimes.current 代替本地变量记录数据,可以保证任何情况下闭包中都能获取到正确数据
          el.searchTimes = gm.el.history.querySelector('#gm-search-times')
          el.searchTimes.current = gm.config.removeHistorySearchTimes < gm.config.removeHistoryData.size ? gm.config.removeHistorySearchTimes : gm.config.removeHistoryData.size
          el.searchTimes.value = el.searchTimes.current

          var stMax = gm.config.removeHistoryData.size
          var stMin = 1
          el.searchTimes.oninput = function() {
            var v0 = this.value.replace(/[^\d]/g, '')
            if (v0 === '') {
              this.value = ''
            } else {
              var value = parseInt(v0)
              if (value > stMax) {
                value = stMax
              } else if (value < stMin) {
                value = stMin
              }
              this.value = value
            }
          }
          el.searchTimes.onblur = function() {
            if (this.value === '') {
              this.value = stMax
            }
            if (this.value != el.searchTimes.current) {
              el.searchTimes.current = this.value
              gm.menu.history.openHandler()
            }
          }
          el.searchTimes.onkeyup = function(e) {
            if (e.keyCode == 13) {
              this.onblur()
            }
          }

          gm.menu.history.openHandler = onOpen
          window.addEventListener('resize', setContentTop)
          el.shadow.onclick = () => {
            closeMenuItem('history')
          }
        }

        /** 移除记录打开时执行 */
        var onOpen = () => {
          if (el.content) {
            var oldContent = el.content
            oldContent.style.opacity = '0'
            setTimeout(() => {
              oldContent.remove()
            }, gm.const.textFadeTime)
          }
          el.content = el.historyPage.appendChild(document.createElement('div'))
          el.content.className = 'gm-content'

          GM_xmlhttpRequest({
            method: 'GET',
            url: gm.url.api_queryWatchlaterList,
            onload: function(response) {
              if (response && response.responseText) {
                try {
                  var bvid = []
                  var json = JSON.parse(response.responseText)
                  var watchlaterList = json.data.list
                  for (var e of watchlaterList) {
                    bvid.push(e.bvid)
                  }
                  var map = new Map()
                  var removeData = gm.config.removeHistoryData.toArray(el.searchTimes.current)
                  el.saveTimes.innerText = removeData.length
                  for (var i = removeData.length - 1; i >= 0; i--) { // 后面的数据较旧,从后往前遍历
                    for (var record of removeData[i]) {
                      map.set(record.bvid, record)
                    }
                  }
                  el.recordNum.innerText = map.size
                  for (var id of bvid) {
                    map.delete(id)
                  }
                  var result = []
                  for (var rm of map.values()) {
                    result.push(`<span>${rm.title}</span><br><a href="${gm.url.page_videoNormalMode}/${rm.bvid}" target="_blank">${rm.bvid}</a>`)
                  }
                  el.removeNum.innerText = result.length

                  setContentTop() // 在设置内容前设置好 top,这样看不出修改的痕迹
                  if (result.length > 0) {
                    el.content.innerHTML = result.join('<br><br>')
                  } else {
                    el.content.innerText = `在最近 ${el.searchTimes.current} 次列表页面数据中没有找到被移除的记录,请尝试增大历史回溯深度`
                    el.content.style.color = 'gray'
                  }
                  el.content.style.opacity = '1'
                } catch (e) {
                  var errorInfo = `网络连接错误,重置脚本数据也许能解决问题。无法解决请联系脚本作者:${GM_info.script.supportURL}`
                  setContentTop() // 在设置内容前设置好 top,这样看不出修改的痕迹
                  el.content.innerHTML = errorInfo
                  el.content.style.opacity = '1'
                  el.content.style.color = 'gray'

                  console.error(errorInfo)
                  console.error(e)
                }
              }
            }
          })
        }

        var setContentTop = () => {
          if (el.content) {
            el.content.style.top = el.comment.offsetTop + el.comment.offsetHeight + 'px'
          }
        }
      }
    }

    /** 重置脚本数据 */
    function resetScript() {
      var result = confirm('是否要重置脚本数据?')
      if (result) {
        var gmKeys = GM_listValues()
        for (var gmKey of gmKeys) {
          GM_deleteValue(gmKey)
        }

        gm.configVersion = 0
        GM_setValue('configVersion', gm.configVersion)
        location.reload()
      }
    }

    /** 对“打开菜单项”这一操作进行处理,包括显示菜单项、设置当前菜单项的状态、关闭其他菜单项 */
    function openMenuItem(name) {
      if (!gm.menu[name].state) {
        for (var key in gm.menu) {
          var menu = gm.menu[key]
          if (key == name) {
            menu.state = true
            menu.openHandler && menu.openHandler()
            fade(true, menu.el)
          } else {
            if (menu.state) {
              closeMenuItem(key)
            }
          }
        }
      }
    }

    /** 对“关闭菜单项”这一操作进行处理,包括隐藏菜单项、设置当前菜单项的状态 */
    function closeMenuItem(name) {
      var menu = gm.menu[name]
      if (menu.state) {
        menu.state = false
        fade(false, menu.el, () => {
          menu.closeHandler && menu.closeHandler()
        })
      }
    }

    /**
     * 用户通知
     *
     * @param {string} msg 信息
     * @param {object} [config] 设置
     * @param {boolean} [config.autoClose=true] 是否自动关闭信息,配合 config.ms 使用
     * @param {number} [config.ms=gm.const.messageTime] 显示时间(单位:ms,不含渐显/渐隐时间)
     * @param {boolean} [config.html=false] 是否将 msg 理解为 HTML
     * @param {object} [config.position=null] 信息框的位置,不设置该项默认为 { top: gm.const.messageTop, left: gm.const.messageLeft }
     * @param {string} config.position.top 信息框元素的 top
     * @param {string} config.position.left 信息框元素的 left
     * @return {HTMLElement} 信息框元素
     */
    function message(msg, config = {}) {
      var defaultConfig = {
        autoClose: true,
        ms: gm.const.messageTime,
        html: false,
        position: null,
      }
      config = { ...defaultConfig, ...config }

      var msgbox = document.body.appendChild(document.createElement('div'))
      msgbox.className = `${gm.id}-msgbox`
      if (config.position) {
        msgbox.style.top = config.position.top
        msgbox.style.left = config.position.left
      }

      if (config.html) {
        msgbox.innerHTML = msg
      } else {
        msgbox.innerText = msg
      }
      fade(true, msgbox, () => {
        if (config.autoClose) {
          setTimeout(() => {
            closeMessage(msgbox)
          }, config.ms)
        }
      })
      return msgbox
    }

    /**
     * 关闭信息
     *
     * @param {HTMLElement} msgbox 信息框元素
     */
    function closeMessage(msgbox) {
      if (msgbox) {
        fade(false, msgbox, () => {
          msgbox && msgbox.remove()
        })
      }
    }

    /**
     * 处理 HTML 元素的渐显和渐隐
     *
     * @param {boolean} inOut 渐显/渐隐
     * @param {HTMLElement} target HTML 元素
     * @param {fadeCallback} [callback] 处理完成后的回调函数
     */
    function fade(inOut, target, callback) {
      // fadeId 等同于当前时间戳,其意义在于保证对于同一元素,后执行的操作必将覆盖前的操作
      var fadeId = new Date().getTime()
      target._fadeId = fadeId
      if (inOut) { // 渐显
        // 只有 display 可视情况下修改 opacity 才会触发 transition
        target.style.display = 'unset'
        setTimeout(() => {
          var success = false
          if (target._fadeId <= fadeId) {
            target.style.opacity = '1'
            success = true
          }
          callback && callback(success)
        }, 10) // 此处的 10ms 是为了保证修改 display 后在浏览器上真正生效,按 HTML5 定义,浏览器需保证 display 在修改 4ms 后保证生效,但实际上大部分浏览器貌似做不到,等个 10ms 再修改 opacity
      } else { // 渐隐
        target.style.opacity = '0'
        setTimeout(() => {
          var success = false
          if (target._fadeId <= fadeId) {
            target.style.display = 'none'
            success = true
          }
          callback && callback(success)
        }, gm.const.fadeTime)
      }
    }
    /**
     * @callback fadeCallback
     * @param {boolean} success 当前 fade 任务是否完成
     */

    /**
     * 在条件满足后执行操作
     *
     * 当条件满足后,如果不存在终止条件,那么直接执行 callback(result)。
     *
     * 当条件满足后,如果存在终止条件,且 stopTimeout 大于 0,则还会在接下来的 stopTimeout 时间内判断是否满足终止条件,称为终止条件的二次判断。
     * 如果在此期间,终止条件通过,则表示依然不满足条件,故执行 stopCallback() 而非 callback(result)。
     * 如果在此期间,终止条件一直失败,则顺利通过检测,执行 callback(result)。
     *
     * @param {Object} options 选项
     * @param {Function} options.condition 条件,当 condition() 返回的 result 为真值时满足条件
     * @param {Function} options.callback 当满足条件时执行 callback(result)
     * @param {number} [options.interval=100] 检测时间间隔(单位:ms)
     * @param {number} [options.timeout=5000] 检测超时时间,检测时间超过该值时终止检测(单位:ms)
     * @param {Function} [options.onTimeout] 检测超时时执行 onTimeout()
     * @param {Function} [options.stopCondition] 终止条件,当 stopCondition() 返回的 stopResult 为真值时终止检测
     * @param {Function} [options.stopCallback] 终止条件达成时执行 stopCallback()(包括终止条件的二次判断达成)
     * @param {number} [options.stopInterval=50] 终止条件二次判断期间的检测时间间隔(单位:ms)
     * @param {number} [options.stopTimeout=0] 终止条件二次判断期间的检测超时时间(单位:ms)
     */
    function executeAfterConditionPass(options) {
      var defaultOptions = {
        condition: () => true,
        callback: result => console.log(result),
        interval: 100,
        timeout: 5000,
        onTimeout: null,
        stopCondition: null,
        stopCallback: null,
        stopInterval: 50,
        stopTimeout: 0,
      }
      var o = {
        ...defaultOptions,
        ...options
      }
      if (!(o.callback instanceof Function)) {
        return
      }

      var cnt = 0
      var maxCnt = o.timeout / o.interval
      var tid = setInterval(() => {
        var result = o.condition()
        var stopResult = o.stopCondition && o.stopCondition()
        if (stopResult) {
          clearInterval(tid)
          o.stopCallback instanceof Function && o.stopCallback()
        } else if (++cnt > maxCnt) {
          clearInterval(tid)
          o.onTimeout instanceof Function && o.onTimeout()
        } else if (result) {
          clearInterval(tid)
          if (o.stopCondition && o.stopTimeout > 0) {
            executeAfterConditionPass({
              condition: o.stopCondition,
              callback: o.stopCallback,
              interval: o.stopInterval,
              timeout: o.stopTimeout,
              onTimeout: () => o.callback(result)
            })
          } else {
            o.callback(result)
          }
        }
      }, o.interval)
    }

    /**
     * 在元素加载完成后执行操作
     *
     * 当元素加载成功后,如果没有设置终止元素选择器,那么直接执行 callback(element)。
     *
     * 当元素加载成功后,如果没有设置终止元素选择器,且 stopTimeout 大于 0,则还会在接下来的 stopTimeout 时间内判断终止元素是否加载成功,称为终止元素的二次加载。
     * 如果在此期间,终止元素加载成功,则表示依然不满足条件,故执行 stopCallback() 而非 callback(element)。
     * 如果在此期间,终止元素加载失败,则顺利通过检测,执行 callback(element)。
     *
     * @param {Object} options 选项
     * @param {Function} options.selector 该选择器指定要等待加载的元素 element
     * @param {Function} options.callback 当 element 加载成功时执行 callback(element)
     * @param {number} [options.interval=100] 检测时间间隔(单位:ms)
     * @param {number} [options.timeout=5000] 检测超时时间,检测时间超过该值时终止检测(单位:ms)
     * @param {Function} [options.onTimeout] 检测超时时执行 onTimeout()
     * @param {Function} [options.stopCondition] 该选择器指定终止元素 stopElement,若该元素加载成功则终止检测
     * @param {Function} [options.stopCallback] 终止元素加载成功后执行 stopCallback()(包括终止元素的二次加载)
     * @param {number} [options.stopInterval=50] 终止元素二次加载期间的检测时间间隔(单位:ms)
     * @param {number} [options.stopTimeout=0] 终止元素二次加载期间的检测超时时间(单位:ms)
     */
    function executeAfterElementLoad(options) {
      var defaultOptions = {
        selector: '',
        callback: el => console.log(el),
        interval: 100,
        timeout: 5000,
        onTimeout: null,
        stopSelector: null,
        stopCallback: null,
        stopInterval: 50,
        stopTimeout: 0,
      }
      var o = {
        ...defaultOptions,
        ...options
      }
      executeAfterConditionPass({
        ...o,
        condition: () => document.querySelector(o.selector),
        stopCondition: o.stopSelector && (() => document.querySelector(o.stopSelector)),
      })
    }

    /** 添加脚本样式 */
    function addStyle() {
      GM_addStyle(`
#${gm.id} .gm-setting {
    font-size: 12px;
    transition: opacity ${gm.const.fadeTime}ms ease-in-out;
    opacity: 0;
    display: none;
    position: fixed;
    z-index: 10000;
    user-select: none;
}
#${gm.id} .gm-setting .gm-setting-page {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #ffffff;
    border-radius: 10px;
    z-index: 65535;
    min-width: 48em;
    padding: 1em 1.4em;
}
#${gm.id} .gm-setting #gm-maintitle {
    cursor: pointer;
}
#${gm.id} .gm-setting #gm-maintitle:hover {
    color: #0075FF;
}
#${gm.id} .gm-setting .gm-items {
    margin: 0 2.2em;
    font-size: 1.2em;
}
#${gm.id} .gm-setting .gm-item {
    display: block;
    padding: 0.6em;
}
#${gm.id} .gm-setting .gm-item:hover {
  color: #0075FF;
}
#${gm.id} .gm-setting .gm-subitem {
    display: block;
    margin-left: 6em;
    margin-top: 0.3em;
}
#${gm.id} .gm-setting .gm-subitem[disabled] {
    color: gray;
}
#${gm.id} .gm-setting .gm-subitem:hover:not([disabled]) {
    color: #0075FF;
}
#${gm.id} .gm-setting input[type=checkbox] {
    vertical-align: middle;
    margin: 3px 0 0 10px;
    float: right;
}
#${gm.id} .gm-setting input[type=text] {
    float: right;
    border-width: 0 0 1px 0;
    width: 2.4em;
    text-align: right;
    padding: 0 0.2em;
    margin-right: -0.2em;
}
#${gm.id} .gm-setting select {
    border-width: 0 0 1px 0;
    cursor: pointer;
}
#${gm.id} .gm-setting .gm-warning {
    position: absolute;
    right: 1.4em;
    color: #e37100;
    font-size: 1.4em;
    line-height: 1em;
    transition: opacity ${gm.const.fadeTime}ms ease-in-out;
    opacity: 0;
    display: none;
}
#${gm.id} .gm-setting .gm-bottom {
    margin: 0.8em 2em 1.8em 2em;
    text-align: center;
}
#${gm.id} .gm-setting .gm-bottom button {
    font-size: 1em;
    padding: 0.2em 0.8em;
    margin: 0 0.6em;
    cursor: pointer;
}
#${gm.id} .gm-setting .gm-bottom button[disabled] {
    cursor: not-allowed;
}

#${gm.id} .gm-history {
    transition: opacity ${gm.const.fadeTime}ms ease-in-out;
    opacity: 0;
    display: none;
    position: fixed;
    z-index: 10000;
    user-select: none;
}
#${gm.id} .gm-history .gm-history-page {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #ffffff;
    border-radius: 10px;
    z-index: 65535;
    height: 75%;
    width: 60%;
}
#${gm.id} .gm-history .gm-comment {
    margin: 0 2em;
    color: gray;
    text-indent: 2em;
}
#${gm.id} .gm-history .gm-comment span,
#${gm.id} .gm-history .gm-comment input {
    padding: 0 0.2em;
    font-weight: bold;
    color: #666666;
}
#${gm.id} .gm-history .gm-comment input{
    text-align: center;
    width: 3em;
    border-width: 0 0 1px 0;
}
#${gm.id} .gm-history .gm-content {
    margin: 1.6em 2em 2em 2em;
    font-size: 1.2em;
    text-align: center;
    line-height: 1.6em;
    overflow-y: auto;
    position: absolute;
    top: 8em;
    bottom: 0;
    left: 0;
    right: 0;
    opacity: 0;
    transition: opacity ${gm.const.textFadeTime}ms ease-in-out;
    user-select: text;
}
#${gm.id} .gm-history .gm-content::-webkit-scrollbar {
    display: none;
}

#${gm.id} #gm-reset {
    position: absolute;
    right: 0;
    bottom: 0;
    margin: 0.6em 0.8em;
    color: #b4b4b4;
    cursor: pointer;
}
#${gm.id} #gm-reset:hover {
    color: #666666;
}

#${gm.id} .gm-title {
    font-size: 1.6em;
    margin: 1.6em 0.8em 0.8em 0.8em;
    text-align: center;
}

#${gm.id} .gm-subtitle {
    font-size: 0.4em;
    margin-top: 0.4em;
}

#${gm.id} .gm-shadow {
    background: #000000b0;
    position: fixed;
    top: 0%;
    left: 0%;
    z-index: 10000;
    width: 100%;
    height: 100%;
}
#${gm.id} .gm-shadow[disabled] {
    cursor: auto;
}

#${gm.id} label {
    cursor: pointer;
}
#${gm.id} input,
#${gm.id} select {
    color: black;
}

#${gm.id} [disabled],
#${gm.id} [disabled] input,
#${gm.id} [disabled] select {
    cursor: not-allowed;
    color: gray;
}

#${gm.id}-watchlater-video-btn {
    float: left;
    margin-right: 1em;
    cursor: pointer;
    font-size: 12px;
}
#${gm.id}-normal-video-btn input[type=checkbox],
#${gm.id}-watchlater-video-btn input[type=checkbox] {
    vertical-align: middle;
    margin: 0 2px 2px 0;
}

.${gm.id}-msgbox {
    position: fixed;
    top: ${gm.const.messageTop};
    left: ${gm.const.messageLeft};
    transform: translate(-50%, -50%);
    z-index: 65535;
    background-color: #000000bf;
    font-size: 16px;
    max-width: 24em;
    min-width: 2em;
    color: white;
    padding: 0.5em 1em;
    border-radius: 0.6em;
    opacity: 0;
    transition: opacity ${gm.const.fadeTime}ms ease-in-out;
    user-select: none;
}
      `)
    }
  })

  // 一般情况下,读取用户配置;如果配置出错,则沿用默认值,并将默认值写入配置中
  function gmValidate(gmKey, defaultValue, writeBack = true) {
    var value = GM_getValue(gmKey)
    if (typeof value == typeof defaultValue) { // typeof null == 'object',对象默认值赋 null 无需额外处理
      return value
    } else {
      if (writeBack) {
        GM_setValue(gmKey, defaultValue)
      }
      return defaultValue
    }
  }

  /** document-start 时期初始化 */
  function initAtDocumentStart() {
    // document-start 级用户配置读取
    if (gm.configVersion > 0) {
      gm.config.redirect = gmValidate('redirect', gm.config.redirect)
    } else {
      GM_setValue('redirect', gm.config.redirect)
    }
  }

  /** 稍后再看模式重定向至正常模式播放 */
  function fnRedirect() {
    window.stop() // 停止原页面的加载
    GM_xmlhttpRequest({
      method: 'GET',
      url: 'https://api.bilibili.com/x/v2/history/toview/web?jsonp=jsonp',
      onload: function(response) {
        if (response && response.responseText) {
          try {
            var part = 1
            if (urlMatch(/watchlater\/p\d+/)) {
              part = parseInt(location.href.match(/(?<=\/watchlater\/p)\d+(?=\/?)/)[0])
            } // 如果匹配不上,就是以 watchlater/ 直接结尾,等同于 watchlater/p1
            var json = JSON.parse(response.responseText)
            var watchlaterList = json.data.list
            location.replace('https://www.bilibili.com/video/' + watchlaterList[part - 1].bvid)
          } catch (e) {
            var errorInfo = `重定向错误,重置脚本数据也许能解决问题。无法解决请联系脚本作者:${GM_info.script.supportURL}`
            console.error(errorInfo)
            console.error(e)

            var rc = confirm(errorInfo + '\n\n是否暂时关闭模式切换功能?')
            if (rc) {
              gm.config.redirect = false
              GM_setValue('redirect', gm.config.redirect)
              location.reload()
            } else {
              location.replace('https://www.bilibili.com/watchlater/#/list')
            }
          }
        }
      }
    })
  }

  /**
   * 判断当前 URL 是否匹配
   *
   * @param {RegExp} reg 用于判断是否匹配的正则表达纯
   * @returns {boolean} 是否匹配
   */
  function urlMatch(reg) {
    return reg.test(location.href)
  }

  /**
   * 推入队列,循环数组实现
   *
   * @param {number} maxSize 队列的最大长度,达到此长度后继续推入数据,将舍弃末尾处的数据
   * @param {number} [capacity=maxSize] 容量,即循环数组的长度,不能小于 maxSize
   */
  function PushQueue(maxSize, capacity) {
    this.index = 0
    this.size = 0
    this.maxSize = maxSize
    if (!capacity || capacity < maxSize) {
      capacity = maxSize
    }
    this.capacity = capacity
    this.data = new Array(capacity)
  }
  /**
   * 设置推入队列的最大长度
   *
   * @param {number} maxSize 队列的最大长度,不能大于 capacity
   */
  PushQueue.prototype.setMaxSize = function(maxSize) {
    if (maxSize > this.capacity) {
      maxSize = this.capacity
    } else if (maxSize < this.size) {
      this.size = maxSize
    }
    this.maxSize = maxSize
    this.gc()
  }
  /**
   * 重新设置推入队列的容量
   *
   * @param {number} capacity 容量
   */
  PushQueue.prototype.setCapacity = function(capacity) {
    if (this.maxSize > capacity) {
      this.maxSize = capacity
      if (this.size > capacity) {
        this.size = capacity
      }
      // no need to gc()
    }
    var raw = this.toArray()
    var data = [...raw.reverse()]
    this.index = data.length
    data.length = capacity
    this.data = data
  }
  /**
   * 队列是否为空
   */
  PushQueue.prototype.empty = function() {
    return this.size == 0
  }
  /**
   * 向队列中推入数据,若队列已达到最大长度,则舍弃末尾处数据
   *
   * @param {Object} value 推入队列的数据
   */
  PushQueue.prototype.push = function(value) {
    this.data[this.index] = value
    this.index += 1
    if (this.index >= this.capacity) {
      this.index = 0
    }
    if (this.size < this.maxSize) {
      this.size += 1
    }
    if (this.maxSize < this.capacity && this.size == this.maxSize) { // maxSize 等于 capacity 时资源刚好完美利用,不必回收资源
      var release = this.index - this.size - 1
      if (release < 0) {
        release += this.capacity
      }
      this.data[release] = null
    }
  }
  /**
   * 将队列末位处的数据弹出
   *
   * @returns {Object} 弹出的数据
   */
  PushQueue.prototype.pop = function() {
    if (this.size > 0) {
      var index = this.index - this.size
      if (index < 0) {
        index += this.capacity
      }
      this.size -= 1
      var result = this.data[index]
      this.data[index] = null
      return result
    }
  }
  /**
   * 将推入队列以数组的形式返回
   *
   * @param {number} [maxLength=size] 读取的最大长度
   * @returns {Array} 队列数据的数组形式
   */
  PushQueue.prototype.toArray = function(maxLength) {
    if (typeof maxLength != 'number') {
      maxLength = parseInt(maxLength)
    }
    if (isNaN(maxLength) || maxLength > this.size || maxLength < 0) {
      maxLength = this.size
    }
    var ar = []
    var end = this.index - maxLength
    for (var i = this.index - 1; i >= end && i >= 0; i--) {
      ar.push(this.data[i])
    }
    if (end < 0) {
      end += this.capacity
      for (i = this.capacity - 1; i >= end; i--) {
        ar.push(this.data[i])
      }
    }
    return ar
  }
  /**
   * 清理内部无效数据,释放内存
   */
  PushQueue.prototype.gc = function() {
    if (this.size > 0) {
      var start = this.index - 1
      var end = this.index - this.size
      if (end < 0) {
        end += this.capacity
      }
      if (start >= end) {
        for (var i = 0; i < end; i++) {
          this.data[i] = null
        }
        for (i = start + 1; i < this.capacity; i++) {
          this.data[i] = null
        }
      } else if (start < end) {
        for (i = start + 1; i < end; i++) {
          this.data[i] = null
        }
      }
    } else {
      this.data = new Array(this.capacity)
    }
  }
})()