1.css通用样式
1 @charset "gb2312"; 3 /* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ global ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/ 4 * { margin:0; padding:0;} 5 html,body { height:100%;} 6 body { background:#d4e3eb; font-family:"微软雅黑","宋体"; position:relative;} 7 ul li, ol li { list-style:none;} 8 h1,h2,h3,h4,h5,h6,em { font-weight:normal;} 9 table { border-collapse:collapse;border-spacing:0}} 10 fieldset,img { border:0; vertical-align:middle;} 11 a { color:#2f3b54; text-decoration:none;} 12 a:focus { outline:0;} 13 a:focus,a:hover { color:#c00;} 14 input,textarea { font-family:"微软雅黑","Arial";} 15 p{word-wrap:break-word} 16 /* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ layout ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/ 17 .clearfix { zoom:1;} /* 清除浮动 */ 18 .clearfix:after { content:"."; display:block; height:0; visibility:hidden; clear:both;} 19 .l { float:left;} 20 .r { float:right;} 21 .c { clear:both;} 22 .block { display:block;} 23 .none { display:none;}
2.减少Div中的html元素
常用的布局元素包括：div,h1,h2,h3,h4,h5,p,label,span,em,strong,ul,li;使用div作为主要的容器,其余元素填充div里面的内容
布局方式：
1 <div> 2 <h1></h1> 3 <p><span></span>xxx</p> 4 </div>
取代
<div> <div id="div1"/> <div id="div2"/> </div>
3.Css Hark问题
<head>
<title></title>
<!--IE条件注释法-->
<!--[if IE 6]>
<link type="text/css" href="#" rel="stylesheet"/>
<![endif]-->
<!--如果大于ie6-->
<!--[if gt IE 6]>
<link type="text/css" href="#" rel="stylesheet"/>
<![endif]-->
<style type="text/css">
.test{60px;height:50px;border:1px solid red;} /* ie6,7,8,9*/
/*选择符前缀法*/
*html .test{70px;} /* ie6*/
*+html .test{80px;} /*ie7*/
/*样式属性前缀法*/
.test1{60px;*70px;_80px;height:50px;border:1px solid green;} /* *ie6,ie7*/
/* _ie6*/
</style>
</head>
<body>
<div class="test"></div>
<div class="test1"></div>
</body>
</html>
<!--[if IE 6]>
<script type="text/javascript">
alert("test");
</script>
<![endif]-->