<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title> New Document </title>
<meta name="Generator" content="EditPlus">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
</head>
<body>
<table id="t1" border="1" width="300">
<tr>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td> </td>
<td> </td>
<td> </td>
</tr>
</table>
<button id="b1" onclick="f1()">add new textbox</button>
</body>
</html>
<script type="text/javascript">
function f1() {
var _t = document.getElementById("t1");
var _i = document.createElement("input");
_i.type = "text";
_i.value = "i am a new textbox";
_t.rows[1].cells[1].appendChild(_i);
}
</script>本回答被提问者采纳