一段JS代码，可用于生成动态表单

<script type="text/javascript">
var a=1;
function d()
{
var s=document.getElementById("ok").innerHTML;
document.getElementById("ok").innerHTML= s + "<p>帐号" + a + "<input type=text id='a" + a + "' name='a" + a + "'></p>";
a+=1;
}
</script>
<input type="button" id="b" onclick="d();" value="增加一行" />
<form id="form1" name="form1" method="post" action="">
<span id="ok">
<p>帐号:  <input name="a1" type="text" id="a1" /></p>
</span>

<input type="submit" />
</form>