问题
How to change the video play speed in HTML5? I\'ve checked video tag\'s attributes in w3school but couldn\'t approach that.Any help would be appreciated!
回答1:
According to this site, this is supported in the playbackRate and defaultPlaybackRate attributes, accessible via the DOM. Example:
/* play video twice as fast */
document.querySelector('video').defaultPlaybackRate = 2.0;
document.querySelector('video').play();
/* now play three times as fast just for the heck of it */
document.querySelector('video').playbackRate = 3.0;
The above works on Chrome 43+, Firefox 20+, IE 9+, Edge 12+.
回答2:
Just type
document.querySelector('video').playbackRate = 1.25;
in JS console of your modern browser.
回答3:
javascript:document.getElementsByClassName("video-stream html5-main-video")[0].playbackRate = 0.1;
you can put any number here just don't go to far so you don't overun your computer.
来源：https://stackoverflow.com/questions/3027707/how-to-change-the-playing-speed-of-videos-in-html5