1.HTML基本结构
<!DOCTYPEhtml>
<htmlxmlns="http://www.w3.org/1999/xhtml">
<headrunat="server">
<title>layout</title>
</head>
<body>
<divclass="header">
<h1>head of your website.</h1>
</div>
<divclass="wrapper">
<divclass="content">
<h2>Your website content here.</h2>
<scripttype="text/javascript">
for(var i = 0; i<100;i++){
document.write(i + "<br />");
}
</script>
</div>
<divclass="clear"><!-- 必不可少 --></div>
</div>
<divclass="footer">
<div><h1>
Copyright (c) 2012</h1></div>
</div>
</body>
</html>
2.CSS样式
<styletype="text/css">
*{
margin: 0;/* 把默认值都设为0 */
}
html, body
{
height: 100%;
width:85%;
margin:0auto;/* 居中 */
}
.header
{
height:100px;
background-color:Fuchsia;
}
.wrapper
{
min-height: 100%;/* IE6 hack*/
height: auto!important;/* height优先级 */
height: 100%;
margin: 0auto-4em;/* 负值必须等于footer的高度 */
}
.content
{
background-color:Silver;
}
.clear/* 清除浮动 */
{
height: 4em; /* clear的height必须和footer的值样高 */
clear:both;
}
.footer
{
height: 4em;
background-color:Aqua;
}
</style>
3.运行
来源：https://www.cnblogs.com/aobingyan/p/3788671.html