js实现星星评分效果

js实现星星评分效果：如图，当鼠标移至某个星星的时候出现相应的评分数，星星的颜色也会变！

1、在做这个之前，先准备好一张图片grading.png如下图，放到images文件夹下，路径为：images/grading.png

2、做一个html文件名为dome.html

里面就包含了两个文件，如下图

demo.html的html代码

<div id="QuacorGrading">
    <strong>评分</strong>
    <input name="1" type="button" />
    <input name="2" type="button" />
    <input name="3" type="button" />
    <input name="4" type="button" />
    <input name="5" type="button" />
    <input name="6" type="button" />
    <input name="7" type="button" />
    <input name="8" type="button" />
    <input name="9" type="button" />
    <input name="10" type="button" />
    <span id="QuacorGradingValue"><b><font size="5" color="#fd7d28">6.5</font></b>分</span>
</div>

domo.html的css代码

<style type="text/css">
*{margin:0;padding:0;list-style-type:none;}
a,img{border:0;}
img{vertical-align:middle;}
#QuacorGrading input{background:url(images/grading.png) no-repeat scroll right center;cursor:pointer;height:30px;width:30px;padding:0;border:0;}
</style>

domo.html的js代码

<script type="text/javascript">
var GradList = document.getElementById("QuacorGrading").getElementsByTagName("input");

for(var di=0;di<parseInt(document.getElementById("QuacorGradingValue").getElementsByTagName("font")[0].innerHTML);di++){
    GradList[di].style.backgroundPosition = 'left center';
}


for(var i=0;i < GradList.length;i++){
    GradList[i].onmouseover = function(){
        for(var Qi=0;Qi<GradList.length;Qi++){
            GradList[Qi].style.backgroundPosition = 'right center';
        }
        for(var Qii=0;Qii<this.name;Qii++){
            GradList[Qii].style.backgroundPosition = 'left center';
        }
        document.getElementById("QuacorGradingValue").innerHTML = '<b><font size="5" color="#fd7d28">'+this.name+'</font></b>分';
    }
}
</script>