【jquery、XML】jquery通过按钮使打开select

 1 <select>
 2     <option>aaaaa</option>
 3     <option>bbbbb</option>
 4     <option>ccccc</option>
 5 </select>
 6 <button>button</button>
 7 <script>
 8     $.fn.openSelect = function() {
 9         return this.each(function(idx,domEl) {
10             if (document.createEvent) {
11                 var event = document.createEvent("MouseEvents");
12                 event.initMouseEvent("mousedown", true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
13                 domEl.dispatchEvent(event);
14             } else if (element.fireEvent) {
15                 domEl.fireEvent("onmousedown");
16             }
17         });
18     }
19     $('button').on('click', function() {
20         $('select').openSelect();
21     });
22 </script>

该处用到了XML的【XML】document.createEvent的使用方法