<!DOCTYPE HTML>
<html>
<head>
<script>
window.onload=function () {
var playbtn=document.getElementById("play");
var video=document.getElementById("video");
playbtn.onclick=function () {
video.play();
}
}
</script>
</head>
<body>
<video controls=controls loop =loop poster="1.jpg" id="video">
<source src="iceage4.mp4"></source>
<source src="iceage4.webm"></source> <!--第一个格式不正确就播放第二个-->
</video>
<input type="button" value="播放" id="play"/>
<audio src="fcml.mp3" controls=controls >
</audio>
</body>
</html>
原文：http://blog.csdn.net/sjtu_chenchen/article/details/45650883