一：美化select表单：chosen.jquery.js
http://harvesthq.github.io/chosen/
关于ajax更新列表后需要触发下插件的事件，才会表现出来：（http://stackoverflow.com/questions/12044330/jquery-chosen-plugin-dynamically-populate-list-by-ajax）
The Chosen plugin does not automatically update its list of options when the OPTION elements in the DOM change. You have to send it an event to trigger the update:
Pre Chosen 1.0: $('.chzn-select').trigger("liszt:updated");
Chosen 1.0 $('.chosen-select').trigger("chosen:updated");