Talk is cheap, show me your code!
1//套入一个4:3的视频
2<iframe id='test' width='100%' src='文档地址' frameborder=0 'allowfullscreen'></iframe>
3<script type="text/javascript">
4document.getElementById("test").style.height=document.getElementById("test").scrollWidth*0.75+"px";
5</script>
