http://img.my.csdn.net/uploads/201309/02/1378129656_3660.jpg
<!DOCTYPE html>
new document
<!--引入一个yui3的种子文件--> .hello{ background-color:red }
<script type="text/javascript" src="http://yui.yahooapis.com/3.3.0/build/yui/yui-min.js"></script>
hhhhhhaaaaa