原生js实现的星级评分效果

<div id="rank" class="pingfen"> 
    <ul> 
        <li></li> 
        <li></li> 
        <li></li> 
        <li></li> 
        <li></li> 
    </ul> 
    <p>加载中</p> 
</div> 

<style type="text/css">    
 *{margin: 0;padding: 0;}    
 .pingfen{ width: 135px; margin:10px auto; height:20px; position: relative;}    
 .pingfen ul{height:20px; margin-bottom: 10px;}    
 .pingfen li{ width: 20px; float: left; height: 20px; cursor: pointer; background:    url(star.png) no-repeat 0 0; list-style: none;}   
  .pingfen .active{background: url(star.png) no-repeat 0 -28px;}  
   .pingfen p{ position: absolute; top:24px; left: 0px; width: 134px; height: 28px;                 
   background: #fff; line-height: 28px; text-align: center; border:1px solid #333;          
    display:none;}  </style> 

JS代码：
<script>

var aData =["很差","较差","一般","推荐","力推"]; 
 
window.onload=function(){ 
    var oDiv = document.getElementById("rank"); 
    var aLi = oDiv.getElementsByTagName("li"); 
    var oP = oDiv.getElementsByTagName("p")[0]; 
    var i =0; 
    for(i=0;i<aLi.length;i++){ 
        aLi[i].index = i; 
            aLi[i].onmouseover = function(){ 
            oP.style.display = "block"; 
            oP.innerHTML=aData[this.index]; 
            for(i=0; i<=this.index;i++){ 
                aLi[i].className="active"; 
            } 
        }; 
        aLi[i].onmouseout = function(){ 
            oP.style.display = ""; 
            for(i=0; i<aLi.length; i++){ 
                aLi[i].className=""; 
            } 
        }; 
        aLi[i].onclick=function(){ 
            alert(this.index +1); 
        }; 
    } 
 
}; 
</script>