Greasy Fork is available in English.
A JavaScript library used by JoeSimmons
此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyfork.icu/scripts/1885/7915/JoeSimmons%27%20Library.js
JSL is a lightweight library that functions similar to jQuery. It is extendable via JSL.fn
It can be used for web pages, and also user-script extensions, like Greasemonkey.
It works in browsers that support ECMAScript-5 (e.g., Firefox 3.6+, Chrome latest, etc).
For API documentation, check the methods page.
.inView or a similar method to determine if an element is in the browser's viewport