<style>
      select{
         padding:5px 0;
         }
      .outer{
         width:500px;
         margin:20px auto;
         }
   </style>

<div class="outer">
   <select name="province" id="province">
      <option value="请选择">请选择</option>
   </select>
   <select name="city" id="city">
      <option value="请选择">请选择</option>
   </select>
   <select name="town" id="town">
      <option value="请选择">请选择</option>
   </select>
</div>

<script src="http://www.jq22.com/jquery/jquery-1.10.2.js"></script>
<script src="https://files.cnblogs.com/files/sz_hesheng/area.js"></script>
<script src="https://files.cnblogs.com/files/sz_hesheng/select.js"></script>