1、要求：提交视頻，另外截取视頻某1帧做为视頻的封面。
2、完成思路：运用canvas绘图图象的作用，绘图图象某1帧，这里绘图了第1帧，很简易就完成了。
3、编码：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF⑻">
<title>capture screen</title>
<style type="text/css">
video,#container{width: 300px;height: 200px;}
#container>img{width: 100%;}
</style>
</head>
<body>
<video id="video" controls="controls">
<source src="video/video_test.mp4">
</video>
<div id="container"></div>
<script type="text/javascript">
(function() {
var video, container;
var scale = 0.8;
var initialize = function() {
container = document.getElementById("container");
video = document.getElementById("video");
video.addEventListener('loadeddata', captureImage);
};
var captureImage = function() {
var canvas = document.createElement("canvas");
canvas.width = video.videoWidth * scale;
canvas.height = video.videoHeight * scale;
canvas.getContext('2d').drawImage(video, 0, 0, canvas.width, canvas.height);
var img = document.createElement("img");
img.src = canvas.toDataURL("image/png");//变换成base64照片，详细地址拿出来便可以立即应用
container.appendChild(img);
};
initialize();
})();
</script>
</body>
</html>
以上便是本文的所有內容，期待对大伙儿的学习培训有一定的协助，也期待大伙儿多多适用脚本制作之家。