<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" > 
<head> 
<title>add_line</title> 
<script language="javascript" type="text/jscript"><!-- 

function add_input_file(tbfile, index) 
{ 
file_name = "file" + index; 
var tr_file = document.createElement("tr"); 
var td_file = document.createElement("td"); 
var input_file = document.createElement("input") 
input_file.setAttribute("type","file") 
input_file.setAttribute("size","50") 
input_file.setAttribute("name",file_name) 

td_file.appendChild(input_file) 
tr_file.appendChild(td_file) 
tbfile.appendChild(tr_file) 
} 
function add_one_file() 
{ 
var tb_file = document.getElementById("upload_file"); 
var count_file = document.getElementById("upload_file").childNodes.length; 
//window.alert(steps_nums); 
add_input_file(tb_file, count_file); 
} 

// --></script> 
</head> 
<body> 
<div style="text-align: center" style="text-align: center"> 
<form> 
<table width="90%"> 
<tr> 
<td> 
<BR /> 
<BR /> 
<h5>配置文件上傳</h5> 
</td> 
</tr> 
<tr> 
<td> 
<table id="upload_file"> 
<tr class="tabletext"> 
<td><input type="file" name="job" size="50"/></td> 
</tr> 
<tr class="tabletext"> 
<td><input type="file" name='file2' size="50"/></td> 
</tr> 
<tr class="tabletext"> 
<td><input type="file" name='file3'size="50"/></td> 
</tr> 
</table> 
</td> 
</tr> 

<tr> 
<td align="left"> 
<input type="button" value="新增一行" onclick="add_one_file()"/> 
<input type="submit" value="保 存"/> 
<input name="ciname" value="{{ciname}}"/> 
<input name="type" value="default"/> 
</td> 
</tr> 
</table> 
</form> 
</div> 
</body> 
</html> 

把所有代碼拷下另存為一個html文件，在瀏覽器中打開，點(diǎn)擊“新增一行”按鈕就可以,以下是對js函數(shù)的解釋

document.createElement 創(chuàng)建一種頁面標(biāo)簽
setAttribute:為某一標(biāo)簽設(shè)置屬性
appendChild:在另一標(biāo)簽中添加一子標(biāo)簽

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