<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<video width="320" height="240" poster="http://img.youguoquan.com/uploads/users/header/f99a9c581c52b5e2245d7e5feb08e2ba.jpg" controls>
<source src="http://img.youguoquan.com/uploads/crowd/videos/2017/07/28/8a5852432f0d496964240b1f41aa3ab9.MP4" type="video/mp4">
</video>
</body>
</html>
需求：如上的代码，在手机端，视频播放退出后，视频的底图应该仍然是播放前的视频底图（即poster属性加上的预览图），而不是视频播放后的最后一帧的图像
添加ended事件重置下src就行了
<video width="320" height="240" poster="http://img.youguoquan.com/uploads/users/header/f99a9c581c52b5e2245d7e5feb08e2ba.jpg" controls>
<source src="http://img.youguoquan.com/uploads/crowd/videos/2017/07/28/8a5852432f0d496964240b1f41aa3ab9.MP4" type="video/mp4">
</video>
<script>
var v = document.getElementsByTagName('video')[0];
v.addEventListener('ended', function () {
this.src = "http://img.youguoquan.com/uploads/crowd/videos/2017/07/28/8a5852432f0d496964240b1f41aa3ab9.MP4"
}, false);
</script>