1.已经在pc上实现了在canvas中播放video标签的视频，现在在手机上进行测试，发现无法播放了
2.
` var fps = 1000/30; // 1/30秒
1
463var videoObj = document.getElementById("sec4-video");
var canvasObj = document.getElementById("sec4-canvas");
var ctx=canvasObj.getContext('2d');
videoObj.addEventListener('play', function() {
var i=window.setInterval(function() {
ctx.drawImage(videoObj,0,0,400,400);},fps);
},true);`
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