Chosen 是一个支持jquery的select下拉框美化插件，它能让丑陋的、很长的select选择框变的更好看、更方便。不仅如此，它更扩展了select，增加了自动筛选的功能。它可对列表进行分组，同时也可禁用某些选择项。
先来看下插件的效果：
下面和大家一起看下它的用法。
引入核心文件
<link rel="stylesheet" href="docsupport/style.css">
<link rel="stylesheet" href="docsupport/prism.css">
<link rel="stylesheet" href="chosen.css">
<script src="jquery-1.6.min.js" type="text/javascript"></script>
<script src="chosen.jquery.js" type="text/javascript"></script>
<script src="docsupport/prism.js" type="text/javascript" charset="utf-8"></script>
构建html
<select data-placeholder="Choose a Country..." class="chosen-select" style="width:350px;" tabindex="2">
<option value=""></option>
<option value="United States">United States</option>
<option value="United Kingdom">United Kingdom</option>
<option value="Afghanistan">Afghanistan</option>
<option value="Aland Islands">Aland Islands</option>
<option value="Albania">Albania</option>
<option value="New Caledonia">New Caledonia</option>
<option value="New Zealand">New Zealand</option>
<option value="Nicaragua">Nicaragua</option>
<option value="Niger">Niger</option>
<option value="Nigeria">Nigeria</option>
<option value="Niue">Niue</option>
<option value="Norfolk Island">Norfolk Island</option>
<option value="Northern Mariana Islands">Northern Mariana Islands</option>
<option value="Norway">Norway</option>
<option value="Oman">Oman</option>
<option value="Pakistan">Pakistan</option>
<option value="Palau">Palau</option>
<option value="Palestinian Territory, Occupied">Palestinian Territory, Occupied</option>
<option value="Panama">Panama</option>
<option value="Papua New Guinea">Papua New Guinea</option>
<option value="Paraguay">Paraguay</option>
<option value="Peru">Peru</option>
<option value="Philippines">Philippines</option>
<option value="Pitcairn">Pitcairn</option>
<option value="Poland">Poland</option>
<option value="Portugal">Portugal</option>
<option value="Zambia">Zambia</option>
<option value="Zimbabwe">Zimbabwe</option>
</select>
写入JS，实现下拉美化与筛选功能，这里是默认，没使用参数，更多请参考例子。
$(".chosen-select").chosen();