鼠标点击后更换背景

 1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3c.org/TR/1999/REC-html401-19991224/loose.dtd">
 2 <HTML><HEAD><TITLE>绝对经典的滑轮新闻显示(javascript+css)</TITLE>
 3 <META http-equiv=Content-Type content="text/html; charset=gb2312">
 4 <style type="text/css">
 5 <!--
 6 *{padding:0; margin:0}
 7 img{border:0; display:block;}
 8 BODY {
 9  PADDING-RIGHT: 0px; PADDING-LEFT: 0px; FONT-SIZE: 12px; PADDING-BOTTOM: 0px; MARGIN: 0px auto; COLOR: black; LINE-HEIGHT: 150%; PADDING-TOP: 10px; BACKGROUND-COLOR: white; TEXT-ALIGN: center
10 }
11 .dis {
12  DISPLAY: block
13 }
14 .undis {
15  DISPLAY: none
16 }
17 #cntR {
18  WIDTH: 302px
19 }
20 #NewsTop {
21  CLEAR: both; MARGIN-BOTTOM: 16px
22 }
23 #NewsTop P {
24  FLOAT: left; LINE-HEIGHT: 21px
25 }
26 #NewsTop P.topTit {
27  FONT-WEIGHT: bold; WIDTH: 117px
28 }
29 #NewsTop P.topC0 {
30  BACKGROUND: #dcdcdc; BORDER-LEFT: #f2f2f2 1px solid; WIDTH: 40px; CURSOR: pointer
31 }
32 #NewsTop P.topC1 {
33  BACKGROUND: #c2130e; BORDER-LEFT: #f2f2f2 1px solid; WIDTH: 40px; COLOR: #fff
34 }
35 #NewsTop #NewsTop_tit {
36  BORDER-BOTTOM: #c2130e 3px solid; HEIGHT: 21px
37 }
38 #NewsTop #NewsTop_cnt {
39  PADDING-LEFT: 32px; BACKGROUND: url(o2007320133249.gif) no-repeat 12px 13px; LINE-HEIGHT: 26px; PADDING-TOP: 7px; HEIGHT: 260px; TEXT-ALIGN: left
40 }
41 #NewsTop #NewsTop_cnt A {
42  COLOR: #666; TEXT-DECORATION: none
43 }
44 #NewsTop #NewsTop_cnt A:hover {
45  COLOR: #c2130e; TEXT-DECORATION: underline
46 }
47 -->
48 </style>
49 </HEAD>
50 <BODY>
51 <DIV id="cntR">
52   <DIV id="NewsTop">
53     <DIV id="NewsTop_tit">
54       <P class="topTit">新闻排行</P>
55       <P class="topC0">国内</P>
56       <P class="topC0">国际</P>
57       <P class="topC0">社会</P>
58       <P class="topC0">网评</P>
59     </DIV>
60     
61             <SCRIPT>
62     var Tags=document.getElementById('NewsTop_tit').getElementsByTagName('p');     var len=Tags.length; 
63  var flag=1;//修改默认值
64     for(i=1;i<len;i++){
65      Tags[i].value = i;
66      Tags[i].onclick=function(){changeNav(this.value)}; 
67      }
68     Tags[flag].className='topC1';    function changeNav(v){ 
69      Tags[flag].className='topC0';     flag=v; 
70      Tags[v].className='topC1';
71      }
72    </SCRIPT>
73   </DIV>
74 </DIV>
75 </BODY></HTML>

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原文地址：https://www.cnblogs.com/wangblognet/p/2777052.html