这是借用的别人的，留在这里只是方便以后自己找到，至于图片，我写路径是原本demo中的路径。直接复制就可以用，再根据自己的东西去修改。
<!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;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;24px;cursor:pointer;text-indent:-9999px;background:url(http://demo.jb51.net/js/2015/js-start-level-pf-codes/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;159px;height:60px;display:none;background:url(http://demo.jb51.net/js/2015/js-start-level-pf-codes/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>