<script>
var str = "<table width='600' border='1' align='center' rules='all'>";
//变量初始化，用变量i代替行<tr></tr>
var i = 1;
while(i<=9){
str += "<tr>";
//循环九列，用变量j来代表列
var j = 1;
while(j<=i){
str += "<td>" + j + "×" + i + "=" + j*i + "</td>";
//变量更新
j++;
}
str += "</tr>";
//变量更新
i++;
}
str += "</table>";
//输出结果
document.write(str);
</script>