如何使用jQuery动态添加表单元素

Here is my html:

这是我的HTML：

<div id="extraPerson">
    <div class="controls controls-row">
      <input class="span3" placeholder="First Name" type="text" name="firstname2">
      <input class="span3" placeholder="Last Name" type="text" name="lastname2">     
         <select class="span2" name="gender2"><option value="Male">Male</option><option           value="Female">Female</option></select>   
        ...ETC
    </div>
</div>

<a href="/go.html?url=#" id="addRow"><i class="icon-plus-sign icon-white"></i> Add another family member</p></a>
<div id="extraPe