<script src="jquery.js"></script> 
<script src="duplicateElement.min.js"></script> 

<form id="myform" name="myform" action="post.php" method="post"> 
  <fieldset id="additional"> 
    <label for="name">客戶姓名：</label> 
    <input id="name" name="name[]" type="text" class="input" > 
    <label for="flag">客戶級(jí)別：</label> 
    <select id="flag" name="flag[]"> 
      <option disabled="" selected="">請(qǐng)選擇</option> 
      <option value="1">VIP</option> 
      <option value="2">普通</option> 
     </select> 
      <a href="javascript:void(0);" class="btn remove">移除</a> 
      <a href="javascript:void(0);" class="btn create">復(fù)制</a> 
    </fieldset> 
    <br/> 
    <div class="sub_btn"> 
      <input type="submit" class="button" value="提交"> 
    </div> 
</form> 

 $(function () { 
    $('#additional').duplicateElement({ 
      "class_remove": ".remove", 
      "class_create": ".create", 
      onCreate: function (el) { 
        el.find("select").prop('defaultSelected'); 
        el.find(".input").val(''); 
      } 
    }); 
  });