<div class="container"> <div class="row"> <ul> <li class="nav-parent"> <a href="javacsript:void(0)"><span>1</span></a> <ul class="children"> <li><a href="javacsript:void(0)">1.1</a></li> <li><a href="javacsript:void(0)">1.2</a></li> <li><a href="javacsript:void(0)">1.3</a></li> </ul> </li> <li class="nav-parent"> <a href="javacsript:void(0)"><span>2</span></a> <ul class="children"> <li><a href="javacsript:void(0)">2.1</a></li> <li><a href="javacsript:void(0)">2.2</a></li> <li><a href="javacsript:void(0)">2.3</a></li> </ul> </li> <li class="nav-parent"> <a href="javacsript:void(0)"><span>3</span></a> <ul class="children"> <li><a href="javacsript:void(0)">3.1</a></li> <li><a href="javacsript:void(0)">3.2</a></li> <li><a href="javacsript:void(0)">3.3</a></li> </ul> </li> </ul> </div> <script type="text/javascript"> $(document).ready(function () { var $container = $('.children'), $trigger = $('.nav-parent'); // 分别获取所有的“父子” $container.hide();// 隐藏所有的“子” $trigger.first().find('.children').show();// 显示第一个“父”的子(展开第一个) $trigger.on('click', function (e) {// 当“父”发生点击事件 if ($(this).find('.children').is(':hidden')) { $trigger.find('.children').hide(300);// 关闭其他 $(this).find('.children').show(300);// 显示自己 } e.preventDefault(); }); }); </script> </div>