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<html>
<head>
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<title>鏈接背景變色</title>
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ul{list-style:none;}
li,a{
width:150px;
height:30px;
text-align:center;
line-height:30px;
margin-bottom:10px;
background-color:#606;
color:white;
display:block;
}
a{text-decoration:none;}
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function changeCss(obj,lis){
for(var i=0;i<lis.length;i++){
lis[i].style.backgroundColor = "#606";
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obj.style.backgroundColor="#F30";
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alinks=box.getElementsByTagName("a");
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<ul id="box">
<li><a href="#">螞蟻部落一</a></li>
<li><a href="#">螞蟻部落二</a></li>
<li><a href="#">螞蟻部落三</a></li>
<li><a href="#">螞蟻部落四</a></li>
<li><a href="#">螞蟻部落五</a></li>
</ul>
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