<section class="main"> <div class="wrapper-demo"> <div id="dd" class="wrapper-dropdown-1" tabindex="1"> <span>手冊網</span> <ul class="dropdown" tabindex=""> <li><a href="#">jQuery特效</a></li> <li><a href="#">網站模板</a></li> </ul> </div> </div> </section></div><script type="text/javascript" src="http://libs.useso.com/js/jquery/1.7.2/jquery.min.js"></script><script type="text/javascript"> function DropDown(el) { this.dd = el; this.placeholder = this.dd.children('span'); this.opts = this.dd.find('ul.dropdown > li'); this.val = ''; this.index = -; this.initEvents(); } DropDown.prototype = { initEvents: function() { var obj = this; obj.dd.on('click', function(event) { $(this).toggleClass('active'); return false; }); obj.opts.on('click', function() { var opt = $(this); obj.val = opt.text(); obj.index = opt.index(); obj.placeholder.text('Gender: ' + obj.val); }); }, getValue: function() { return this.val; }, getIndex: function() { return this.index;} } $(function() { var dd = new DropDown($('#dd')); $(document).click(function() { $('.wrapper-dropdown-1').removeClass('active'); }); });</script>