乘法表能进行删除

<!DOCTYPE html PUBLIC "-//W3C//DTDXHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=gb2312" />
<!-- TemplateBeginEditable name="doctitle" -->
<title>99乘法表</title>
<style>
div{
background-color:#00FF33;
width:480px;
height:220px;
}
table{
border:#00CCFF 1px solid;
}
</style>
<script language="javascript" type="text/javascript">
//绘制表格
function drawTable(){
//1、创建表格（行、列）
var table=document.createElement("table");
table.setAttribute("border","1");
for(var i=1;i<=9;i++){
//循环的创建tr
var tr=document.createElement("tr");
for(var j=1;j<=i;j++){
var text=document.createTextNode(j+"*"+i+"="+i*j);
var td=document.createElement("td");
td.appendChild(text);
tr.appendChild(td);
}
table.appendChild(tr);
}
document.getElementById("d1").appendChild(table);
}
function delTable(){
var tr=document.getElementsByTagName("tr");
var table=tr[0].parentNode;
var element=table.removeChild(tr[tr.length-1]);
//alert(element.nodeName);
}
</script>
</head>
<body>
<div id="d1">
</div>
<input type="button" onclick="drawTable()" value="绘制乘法表"/>
<input type="button" onclick="delTable()" value="删除一行"/>
</body>
</html>