GM Common API (GMC) is a simple library designed for easily adding Greasemonkey 4 compatibilty to existing userscripts
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此脚本不应直接安装，它是一个供其他脚本使用的外部库。如果您需要使用该库，请在脚本元属性加入：// @require https://update.gf.qytechs.cn/scripts/34527/226826/GMCommonAPIjs.js
GM Common (GMC) is an API designed for easily adding Greasemonkey 4 compatibility to existing userscripts.
GMC provides a common subset of the functionality offered by the new "asynchronous API" in Greasemonkey 4 (GM.*) and the classic "synchronous API" from other userscript managers (GM_*), offered in a single "classic" synchronous API (GMC.*).
With the introduction of the Greasemonkey 4 WebExtension (currently in beta), the classic GM_* "synchronous" API is replaced with a new GM.* "asynchronous API". The features of the new API in Greasemonkey 4 (GM4) are very similar to the classic API, but the functions are asynchronous. This means you might need to (learn asynchronous programming and) do some refactoring of your existing userscripts to make use of the new API in GM4.
As an alternative to refactoring your code, GMC offers a "synchronous subset" of the GM APIs, which works with scripts running in both the new GM4, in the older versions of Greasemonkey, and in other userscript managers like Tampermonkey and Violentmonkey. Where APIs are supported in GMC, no refactoring of your script is needed; Simply add GMC @require/@grants statements in meta-block of your userscript, and replace the use of GM_* methods with equivalent GMC.* methods.
For more info, see GitHub repository or the source code.
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