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test.php
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>document示例</title>
</head>
<body onload="test()">
<table id ="czy"><tr><td>★</td><td>★</td><td>★</td><td>★</td><td>★</td></tr></table>
<input type="button" id="ok" value="打分">
<script>
var tds=document.getElementsByTagName("td");
for(var i=0;i<tds.length;i++){
tds[i].onmouseover=test;
}
var index;
function test(){
for(var i=0;i<tds.length;i++){
if(tds[i]==this)
{
index=i;
}
}
//选中的设置成红色 没选中的设置成黑色
for(var i=0;i<=index;i++) {
tds[i].style.color = "red";
}
for(var i=index+1;i<tds.length;i++){
tds[i].style.color="black";
}
}
document.getElementById("ok").onclick=function(){
alert("评分："+(index+1)+"分");
}
</script>
</body>
</html>