YouTube Helper API.
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.cn-greasyfork.org/scripts/549881/1670161/YouTube%20Helper%20API.js
@grant should be used if the consumer script wishes to use the Greasemonkey compatible parts of the storage API.
Both the GM.* and GM_* versions are supported for the following functions:
getValuesetValuedeleteValuelistValuesNote: If no relevant @grant is used, the script will automatically fall back to using standard localStorage instead.