每次赋值输出数组该项的值，请问哪里出错了
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>二维数组</title>
<script type="text/javascript">
var i,j;
var arry=new Array();
for(i=0;i<3;i++)
{
for(j=0;j<6;j++)
{
arry[i][j]=i*j;
document.write(arry[i][j]);
}
}
</script>
</head>
<body>
</body>
</html>
