js实现前台动态添加文本框,后台获取文本框内容

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html>
<title>
</title>
<head>
</head>
<body >
<form id="form1" action="request.jsp">
<script language="javascript" type="text/javascript">

var count=0 ;
function additem(id)
{
    var row,cell,str;
    row = document.getElementById(id).insertRow();
    if(row != null )
    {
cell = row.insertCell();
cell.innerHTML="<input id=\"St"+count+"\" type=\"text\" name=\"St"+count+"\" value= \"St"+count+"\"><input type=\"button\" value=\"删除\" onclick=\'deleteitem(this);\'>";
count ++;
    }
}
function deleteitem(obj)
{
    var curRow = obj.parentNode.parentNode;
    tb.deleteRow(curRow.rowIndex);
}

function getsub()
{
var re="";
for (var    i = 0 ;i<count;i++)
{
re += document.getElementsByName("St"+i)[0].value;

}
document.getElementById("Hidden1").value=re;
}


</script><table id="tb"></table>
<input name="button" type="button" onclick='additem("tb")' value="添加>>"/><inputtype="submit" name="submit" onclick="getsub()" value="提交"/>
        <input id="Hidden1" name="Hidden1" type="hidden" value="" />
        </form>
</body>

</html>

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