console 命令行工具 X clear
console
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>乘法表</title>
    <script type="text/javascript">
        for (let i = 1; i <= 9; i++) {
            let ans = "";
            for (let j = 1; j <= i; j++) {
                ans += j + "X" + i + "=" + (i * j) + " ";
            }
            console.log(ans);
        }
    </script>
</head>
<body>
    <p>乘法表</p>
</body>

</html>