js实现元素添加样式 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<style>
.red{color:red;}
.blue{color:blue;}
#w a{display:block;}
.red img{display:block!important;}
#w a img{display:none;}
</style>
<body>
<div id="w">
    <a class="red" title="1">1<img src="" width="100" height="50" alt="1"></a>
    <a title="2">2<img src="" width="100" height="50" alt="2"></a>
    <a title="3">3<img src="" width="100" height="50" alt="3"></a>
    <a title="4">4<img src="" width="100" height="50" alt="4"></a>
</div>
<script>
window.onload=function(){
var oD=document.getElementById("w");
var oA=oD.getElementsByTagName("a");
var oImg=oD.getElementsByTagName("img");
for(var i=0;i<oA.length;i++){
oA[i].onclick=function(){
//onclick--onmouseover
for(var i=0;i<oA.length;i++){
if(this.title==oA[i].title){
//if(this==oA[i])
//this(当前点击)
//oA[i]循环中被选择
this.className="red";
oImg[i].style.display="block";
}
else{
oA[i].className="blue";
oImg[i].style.display="none";
}
}
};
}
};
</script>
</body>
</html>

类似：http://blog.163.com/fan_yishan/blog/static/4769221320141241517368/

思路有些乱，望指教！

posted on 2015-09-14 11:52  源人  阅读(3324)  评论(0)  编辑  收藏  举报

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