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将网页背景色改为护眼灰
// ==UserScript==
// @name grayBackgroundColor
// @namespace https://github.com/sakuyaa/gm_scripts
// @author sakuyaa
// @description 将网页背景色改为护眼灰
// @include *
// @inject-into auto
// @version 2024.4.1
// @compatible firefox 74
// @grant GM_addStyle
// @note 配合browser.display.background_color;#DCDCDC使用
// @run-at document-end
// ==/UserScript==
(function() {
let grayValue = 225;
let sleep = time => {
return new Promise(resolve => setTimeout(resolve, time));
};
let grayElem = async elem => { //将元素变灰
await sleep(0);
let rgbaValues = window.getComputedStyle(elem)?.getPropertyValue('background-color')?.match(/\d+(\.\d+)?/g);
if (rgbaValues) {
let [red, green, blue, alpha] = rgbaValues;
if (red <= grayValue || green <= grayValue || blue <= grayValue || alpha == 0) {
return;
}
//从225-255压缩到215-225
elem.style.setProperty('background-color', (alpha ? 'rgba(' : 'rgb(') +
Math.floor((red - grayValue) / 3 + grayValue - 10) + ', ' +
Math.floor((green - grayValue) / 3 + grayValue - 10) + ', ' +
Math.floor((blue - grayValue) / 3 + grayValue - 10) +
(alpha ? (', ' + alpha + ')') : ')'), 'important');
}
}
let grayBackgroundColor = async () => {
await sleep(0);
for (let elem of document.getElementsByTagName('*')) {
grayElem(elem);
}
}
let fixNotGray = () => { //去除一些背景为空白图的网站
switch (window.location.hostname) {
case 'www.w3school.com.cn':
GM_addStyle('#wrapper {background: #dcdcdc none !important;}');
return;
}
let herf = window.location.href;
if (/^https?:\/\/tieba\.baidu\.com\/f.+/i.test(herf)) {
GM_addStyle('.forum_content {background: #dcdcdc none !important;}');
}
}
grayBackgroundColor();
let count = 0;
let intervalId = setInterval(() => {
for (let elem of document.getElementsByTagName('*')) {
if (++count > 9) {
break; //次数过多也不再循环处理
}
let rgbaValues = window.getComputedStyle(elem)?.getPropertyValue('background-color')?.match(/\d+(\.\d+)?/g);
if (rgbaValues) {
let [red, green, blue, alpha] = rgbaValues;
if (red > grayValue && green > grayValue && blue > grayValue && alpha != 0) {
grayBackgroundColor();
return; //存在需要处理的元素，则处理后继续循环
}
}
}
clearInterval(intervalId); //没有需要处理的元素，则不再循环处理
}, 1234);
(new MutationObserver(async mutations => {
for (let mutation of mutations) {
for (let elem of mutation.addedNodes) {
if (elem.nodeType == 1) { //元素节点
grayElem(elem);
for (let childNode of elem.getElementsByTagName('*')) { //遍历所有子节点
grayElem(childNode);
}
}
}
}
})).observe(document.body, {
childList: true,
subtree: true
});
fixNotGray();
})();