JavaScript实现带悬浮提示的星级评分组件

<!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>星级评分系统</title>
<style> 
body,div,ul,li,p{margin:0;padding:0;}
body{color:#666;font:12px/1.5 Arial;}
ul{list-style-type:none;}
#star{position:relative;width:600px;margin:10px auto;}
#star ul,#star span{float:left;display:inline;height:19px;line-height:19px;}
#star ul{margin:0 10px;}
#star li{float:left;width:24px;cursor:pointer;text-indent:-9999px;background:url(images/star.png) no-repeat;}
#star strong{color:#f60;padding-left:10px;}
#star li.on{background-position:0 -28px;}
#star p{position:absolute;top:20px;width:159px;height:60px;display:none;background:url(images/icon.gif) no-repeat;padding:7px 10px 0;}
#star p em{color:#f60;display:block;font-style:normal;}
</style>
<script type="text/javascript"> 
window.onload = function ()
{
 var oStar = document.getElementById("star");
 var aLi = oStar.getElementsByTagName("li");
 var oUl = oStar.getElementsByTagName("ul")[0];
 var oSpan = oStar.getElementsByTagName("span")[1];
 var oP = oStar.getElementsByTagName("p")[0];
 var i = iScore = iStar = 0;
 var aMsg = [
    "很不满意|差得太离谱，与卖家描述的严重不符，非常不满",
    "不满意|部分有破损，与卖家描述的不符，不满意",
    "一般|质量一般，没有卖家描述的那么好",
    "满意|质量不错，与卖家描述的基本一致，还是挺满意的",
    "非常满意|质量非常好，与卖家描述的完全一致，非常满意"
    ]
 for (i = 1; i <= aLi.length; i++)
 {
  aLi[i - 1].index = i;
  //鼠标移过显示分数
  aLi[i - 1].onmouseover = function ()
  {
   fnPoint(this.index);
   //浮动层显示
   oP.style.display = "block";
   //计算浮动层位置
   oP.style.left = oUl.offsetLeft + this.index * this.offsetWidth - 104 + "px";
   //匹配浮动层文字内容
   oP.innerHTML = "<em><b>" + this.index + "</b> 分 " + aMsg[this.index - 1].match(/(.+)\|/)[1] + "</em>" + aMsg[this.index - 1].match(/\|(.+)/)[1]
  };
  //鼠标离开后恢复上次评分
  aLi[i - 1].onmouseout = function ()
  {
   fnPoint();
   //关闭浮动层
   oP.style.display = "none"
  };
  //点击后进行评分处理
  aLi[i - 1].onclick = function ()
  {
   iStar = this.index;
   oP.style.display = "none";
   oSpan.innerHTML = "<strong>" + (this.index) + " 分</strong> (" + aMsg[this.index - 1].match(/\|(.+)/)[1] + ")"
  }
 }
 //评分处理
 function fnPoint(iArg)
 {
  //分数赋值
  iScore = iArg || iStar;
  for (i = 0; i < aLi.length; i++) aLi[i].className = i < iScore ? "on" : "";
 }
};
</script>
</head>
<body>
<div id="star">
 <span>点击星星就能打分</span>
 <ul>
 <li><a href="javascript:;">1</a></li>
 <li><a href="javascript:;">2</a></li>
 <li><a href="javascript:;">3</a></li>
 <li><a href="javascript:;">4</a></li>
 <li><a href="javascript:;">5</a></li>
 </ul>
 <span></span>
 <p></p>
</div>
</body>
</html>