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add "DOWNLOAD" button to image
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/495738/1380849/add-download-btn.js
...
// @require https://code.jquery.com/jquery-3.3.1.slim.min.js
// @require https://update.greasyfork.icu/scripts/495738/1380847/add-download-btn.js
...
var text = "DOWNLOAD";
var className = "btn";
$("img").addDownloadBtn(text, className);
