jQuery dynamically adds input type=file implementation code

<form id="fileForm" action="" method="post" enctype="multipart/form-data"> 
<tr> 
<td> 
<input type="file" name="file"><input type="button" id="addButon" value="Add" onclick="add()"> 
</td> 
</tr> 
</form>

//添加一行<tr> 
function add() { 
var content = "<tr><td>"; 
content += "<input type=&#39;file&#39; name=&#39;file&#39;><input type=&#39;button&#39; value=&#39;Remove&#39; onclick=&#39;remove(this)&#39;>"; 
content += "</td></tr>" 
$("#fileForm").append(content); 
} 
//删除当前行<tr> 
function remove(obj) { 
$(obj).parent().parent().remove(); 
}