var rating=(function (){

//点亮

var lightOn=function ($item,num){

$item.each(function(index){

console.log($item);

if(index<num){

$(this).css("background-position","0 -32px");

} else {

$(this).css("background-position","0 -0");

};

});

};

var init=function(el,num){

$rating=$(el);

$item=$rating.find(".rating-item");

//初始化

lightOn($item,num);

//事件绑定

$rating.on("mouseover",".rating-item",function(){

lightOn($item,$(this).index()+1);

}).on("click",".rating-item",function(){

num=$(this).index()+1;

}).on("mouseout",function(){

lightOn($item,num);

});

}

//jquery插件

$.fn.extend({

rating:function(num){

return this.each(function(){

init(this,num);

})

}

});

return {

init:init

};

})();

$("#rating").rating(2);

$("#rating2").rating(3);