<div style="text-align:center;">
<button onclick="playPause()">播放/暂停</button>
<button onclick="makeBig()">大</button>
<button onclick="makeNormal()">中</button>
<button onclick="makeSmall()">小</button>
<video id="video1" width="420" style="margin-top:15px;">
<source src="/example/html5/mov_bbb.mp4" type="video/mp4" />
<source src="/example/html5/mov_bbb.ogg" type="video/ogg" />
Your browser does not support HTML5 video.
<script type="text/javascript">
var myVideo=document.getElementById("video1");