JavaScript 实现星级评分交互效果

<!doctype html>
<html>
<head>
 <meta charset="gbk"> 
 <title>切换</title>
 <style>
.wrapper{width:300px; margin:10px auto; font:14px/1.5 arial;}
/*tab*/
#star{overflow:hidden;}
#star li{
float:left;
width:20px;
height:20px;
margin:2px;
display:inline;
color:#999;
font:bold 18px arial;
cursor:pointer
}
#star .act{
color:#c00
}
#star_word{
width:80px;
height:30px;
line-height:30px;
border:1px solid #ccc;
margin:10px;
text-align:center;
display:none
}
</style>
<script>
window.onload = function(){
 var star = document.getElementById("star");
 var star_li = star.getElementsByTagName("li");
 var star_word = document.getElementById("star_word");
 var result = document.getElementById("result");
 var i=0;
 var j=0;
 var len = star_li.length;
 var word = ['很差','差','一般',"好","很好"]
 for(i=0; i<len; i++){
 star_li[i].index = i;
 star_li[i].onmouseover = function(){
 star_word.style.display = "block";
 star_word.innerHTML = word[this.index];
 for(i=0; i<=this.index; i++){
  star_li[i].className = "act";
 }
 }
 star_li[i].onmouseout = function(){
 star_word.style.display = "none";
 for(i=0; i<len; i++){
  star_li[i].className = "";
 }
 }
 star_li[i].onclick = function(){
 result.innerHTML = (this.index+1)+"分";
 }
 }
}
</script>
</head>
<body>
<div class="wrapper">
打分结果 
<span id="result"></span>
<ul id="star">
<li>★</li>
<li>★</li>
<li>★</li>
<li>★</li>
<li>★</li>
</ul>
<div id="star_word">一般</div>
</div> 
</body> 
</html>