jquery 栏目跟随效果

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<ul class="clear fr nav_active" id="main_menu">                                                     <li class="1"><a href="/" target=""> 首页</a><i></i></li>                                                                                 <li class="1 nav_active"><a href="/business.html" target=""> 商业</a><i></i></li>                                                                                 <li class="1"><a href="/Art.html" target=""> 艺术</a><i></i></li>                                                                       <!-- <li class='nav_active'><a href="">商业3</a><i></i></li>                 <li><a href="">艺术</a><i></i></li>                 <li><a href="">风云榜</a><i></i></li>                 <li><a href="">接招</a><i></i></li>                 <li><a href="">招聘</a><i></i></li> -->               </ul>                         <script type="text/javascript">   $(function(){       //栏目跟随效果     $("#main_menu a").each(function(){         if ($(this)[0].href == String(window.location)) {             $(this).parentsUntil("#main-menu>ul>li").addClass("nav_active");         }     }); });     </script>