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3-3while实现1到100相加求和.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>while实现1到100相加求和</title>
</head>

<body>
    <script>
        // while实现1-100相加求和
        var num = 1;
        var sum = 0;
        while (num <= 100) {
            if (num < 100) {
                document.write(num + '+');
            } else {
                document.write(num + '=');
            }
            sum = sum + num;
            num++;
        }
        document.write(sum);
    </script>
</body>

</html>