css+jq实现星星评分

img:

css:

.rating{
    width:80px;
    height:16px;
    margin:0 0 20px 0;
    padding:0;
    list-style:none;
    clear:both;
    position:relative;
    background: url(images/star-matrix.gif) no-repeat 0 0;
}

.nostar {background-position:0 0}
.onestar {background-position:0 -16px}
.twostar {background-position:0 -32px}
.threestar {background-position:0 -48px}
.fourstar {background-position:0 -64px}
.fivestar {background-position:0 -80px}
ul.rating li {
    cursor: pointer;
 /*ie5 mac doesn't like it if the list is floated*/
    float:left;
    /* end hide*/
    text-indent:-999em;
}
ul.rating li a {
    position:absolute;
    left:0;
    top:0;
    width:16px;
    height:16px;
    text-decoration:none;
    z-index: 200;
}
ul.rating li.one a {left:0}
ul.rating li.two a {left:16px;}
ul.rating li.three a {left:32px;}
ul.rating li.four a {left:48px;}
ul.rating li.five a {left:64px;}
ul.rating li a:hover {
    z-index:2;
    width:80px;
    height:16px;
    overflow:hidden;
    left:0;    
    background: url(images/star-matrix.gif) no-repeat 0 0
}
ul.rating li.one a:hover {background-position:0 -96px;}
ul.rating li.two a:hover {background-position:0 -112px;}
ul.rating li.three a:hover {background-position:0 -128px}
ul.rating li.four a:hover {background-position:0 -144px}
ul.rating li.five a:hover {background-position:0 -160px}

html:

<ul id="rating" class="rating scorestar">
    <li class="one" ><a href="#" title="1 Star">1</a></li>
    <li class="two"><a href="#" title="2 Stars">2</a></li>
    <li class="three"><a href="#" title="3 Stars">3</a></li>
    <li class="four" ><a href="#" title="4 Stars">4</a></li>
    <li class="five" ><a href="#" title="5 Stars">5</a></li>
</ul>

jq:

$(function(){
// 评分
    $("#rating li").bind("click", function () {
        var socre = $(this).attr("class");
        $("#rating").attr("class", "").addClass("rating").addClass(socre + "star");
    })
})