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Paste_Image.png
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style media="screen" type="text/css">
html,
body {
width: 100%;
height: 100%;
overflow: hidden;
}
#vid {
position: absolute;
top: 50%;
left: 50%;
-webkit-transform: translateX(-50%) translateY(-50%);
transform: translateX(-50%) translateY(-50%);
min-width: 100%;
min-height: 100%;
width: auto;
height: auto;
z-index: -1000;
overflow: hidden;
}
</style>
</head>
<body>
<video id="vid" video autobuffer autoplay>
<source id="mp4" src="http://grochtdreis.de/fuer-jsfiddle/video/sintel_trailer-480.mp4" type="video/mp4">
</video>
</body>
</html>
参考地址：http://stackoverflow.com/questions/10797632/simulate-background-sizecover-on-video-or-img
