用query通過類來選擇元素，但是index索引值卻不對，我希望的是按照順序012345這樣，可是sub-nav的li索引又是從0開始html代碼<ul class="nav nav-pills nav-stacked main-nav" role="tablist">            <li class="nav-bar">LAYOUT</li>             <li class="nav-bar">SIGNAL</li>             <li class="nav-bar">USER</li>             <li id="sys">SYSTEM SETTING                 <ul class="sub-nav">                     <li class="nav-bar">SYSTEM TIME</li>                     <li class="nav-bar">NET SETTING</li>                     <li class="nav-bar">VERISION INFO</li>                     <li data-toggle="modal" data-target="#quit">QUIT</li>                 </ul>             </li>         </ul>js代碼$(".nav-bar").click(function(){    var index=$(this).index();     console.log(index); });