B站or阿里云盘2倍速播放
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document.querySelector('video').playbackRate = 2
阿里云盘
var videos=document.querySelectorAll("video");for (var video of videos ){ video.playbackRate=2;}
document.querySelector('video').playbackRate = 2
var videos=document.querySelectorAll("video");for (var video of videos ){ video.playbackRate=2;}