1 导入外部js文件：
1.<script type="text/javascript" src="myjs/xx.js"></script>
2.<script language="javascript" src="myjs/xx.js"></script>
2 导入外部css文件：
<link rel="stylesheet" type="text/css" href="/css/mycss.css"/>
rel、stylesheet属性作用：首先，link标签是用于当前文档引用外部文档的，其次，这个标签的rel属性用于设置对象和链接目的间的关系，说白了就是指明你链进来的对象是个什么东西的.
In this specification, the expression collapsing margins means that adjoining margins (no non-empty content, padding or border areas or clearance separate them) of two or more boxes (which may be next to one another or nested) combine to form a single margin.
In CSS 2.1, horizontal margins ne ......
首先是HTML代码:
<div id="outer">
<div id="leftFrame" style="width: 20%;">
<div style="height: 30%" id="packageListFrame" title="All Packages" >
Package list goes here
</div>
&n ......
