详解HTML5使用DOM进行自定义控制示例代码

<div id="video_div" style="text-align:center;"> 
<button onclick="playPause()">播放/暂停</button> 
<button onclick="toBig()">大</button> 
<button onclick="toNormal()">中</button> 
<button onclick="toSmall()">小</button> 
  
<video id="myVideo" width="500" height="250" style="margin-top:15px;"> 
<source src="demo.mp4" type="video/mp4" /> 
<source src="demo.ogg" type="video/ogg" /> 
您的浏览器不支持此HTML5 视频标签。 
</video> 
</div>

<script type="text/javascript"> 
var myVideo=document.getElementById("myVideo"); 
function playPause() 
{ 
if (myVideo.paused) 
myVideo.play(); 
else 
myVideo.pause(); 
} 
function toBig() 
{ 
myVideo.width=560; 
} 
function toNormal() 
{ 
myVideo.width=420; 
} 
function toSmall() 
{ 
myVideo.width=320; 
} 
</script>