值传参

<ul id="menu">
        <li id='item1' class="">房产</li>
        <li id='item2' class="">家居</li>
        <li id='item3' class="">二手房</li>
    </ul>
   <div class='panel'>
            <ul class="list">
                <li>1</li>
                <li>1</li>
                <li>1</li>
                <li>1</li>
            </ul>
        </div>
   <script src="http://libs.baidu.com/jquery/1.9.1/jquery.min.js"></script>
   <script>
       var 
           omenu =$('#menu'),
           aLi = $('#menu li'),
           opaner = $('.panel'),
           apaner = $('.panel li');
       console.log(apaner)

       $.each(aLi,function(index,val){
           console.log(aLi[index])
           var ev= aLi[0];
           (function (ev){
           this.a(ev);
           }(ev))
       })
       console.log(ev)
       function a(ev){
           this.ev = ev;
       }
           console.log(ev)
//       $.each(apaner,function(index,val){
//           console.log(apaner[index])
//       })
       当你点击的时候，会触发ev事件源对象
       ev.addEventListener('click',function (event){
           var target = event.target;
           console.log(event.target)
       })
       或者

　　　　function c(ev){
           var cc = this.ev;
           console.log(cc);
　　　　}