<!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>
<style type="text/css">
.one{
background-color:#9FC;
}
.two{
background-color:#F9C;
}
.over{
background-color:#FF0;
}
</style>
<script type="text/javascript">
var colorname;
function changerow(){
var rowcolor=document.getElementById("xiao");//用getElementById()传参时要用引号！getElementsByTagname()也用！
var rowcol=rowcolor.rows;
for(var i=1;i<rowcol.length;i++){
if(i%2==1)
rowcol[i].className="one";
else
rowcol[i].className="two";
rowcol[i].onmouseover=function(){
colorname=this.className; //移上变化，所以是把this.className的值传给colorname
this.className="over"; //className对应html中的class，this代表事件源对象，作用：把这一行的class变为指定的值
}
rowcol[i].onmouseout=function(){
this.className=colorname; //移出变化，所以是把colorname 的值传给 this.className
}
}
}
</script>
</head>
<body onload="changerow()">
<table id="xiao" border="1">
<tr style="background-color:teal">
<td>哈哈哈</td>
<td>哈哈哈</td>
<td>哈哈哈</td>
<td>哈哈哈</td>
</tr>
<tr>
<td>呵呵呵呵呵呵</td>
<td>呵呵呵呵呵呵</td>
<td>呵呵呵呵呵呵</td>
<td>呵呵呵呵呵呵</td>
</tr>
<tr>
<td>嘎嘎嘎嘎嘎嘎</td>
<td>嘎嘎嘎嘎嘎嘎</td>
<td>嘎嘎嘎嘎嘎嘎</td>
<td>嘎嘎嘎嘎嘎嘎</td>
</tr>
<tr>
<td>嘿嘿嘿嘿嘿嘿</td>
<td>嘿嘿嘿嘿嘿嘿</td>
<td>嘿嘿嘿嘿嘿嘿</td>
<td>嘿嘿嘿嘿嘿嘿</td>
</tr>
<tr>
<td>呼呼呼呼呼呼</td>
<td>呼呼呼呼呼呼</td>
<td>呼呼呼呼呼呼</td>
<td>呼呼呼呼呼呼</td>
</tr>
</table>
</body>
</html>
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