<script type="text/javascript">

var rating = (function(){

//点亮整颗

var lightEntire = function(el,options){

this.$el = $(el);

this.$item = this.$el.find('.rating-item');

this.opts = options;

};

lightEntire.prototype.init = function(){

this.lightOn(this.opts.num);

if(!this.opts.readOnly){

this.bindEvent();

}

};

lightEntire.prototype.lightOn = function(num){

num = parseInt(num);

this.$item.each(function(index){

if(index < num){

$(this).css('background-position','0 -40px')

}else{

$(this).css('background-position','1px 0')

}

});

};

lightEntire.prototype.bindEvent = function(){

var self = this;

var itemLength = self.$item.length;

//事件绑定

self.$el.on('mousemove','.rating-item',function(){

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

self.lightOn(num);

//短路写法，只有&&前面的成立，才能执行后面的代码

(typeof self.opts.selected === 'function') && self.opts.selected.call(this,num,itemLength);

//在父容器上触发一个事件

self.$el.trigger('selected',[num,itemLength]);

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

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

//短路写法，只有&&前面的成立，才能执行后面的代码

(typeof self.opts.chosen === 'function') && self.opts.selected.call(this,self.opts.num,itemLength);

//在父容器上触发一个事件

self.$el.trigger('chosen',[self.opts.num,itemLength]);

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

self.lightOn(self.opts.num);

})

};

//默认参数

var defaults = {

num:0,

readOnly:false,//是否只读

selected:function(){},

chosen:function(){}

}

//初始化

var init = function(el,options){

options = $.extend({},defaults,options);//用户传递参数时，使用传递参数，options的内容覆盖defalts。生成的内容存在空对象里。

new lightEntire(el,options).init();

}

return {

init:init

}

})();

rating.init('#rating',{

num:2,

// selected:function(num,total){

// console.log(num+'/'+ total)

// },

})

$('#rating').on('selected',function(e,num,total){

console.log(num+'/'+ total)

}).on('chosen',function(e,num,total){

console.log(num+'/'+ total)

})

</script>