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case04-2 函数求阶乘.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>函数求阶乘</title>
</head>
<body>
    <script>
        function getJC(n) {
            var num = 1;
            for (var i = 2; i <= n; i++) {
                num *= i;
            }
            return num;
        }
       console.log('3的阶乘是'+getJC(3));
        function getSum(n) {
            var sum = 0;
            for (var i = 1; i <= n; i++) {
                sum += getJC(i);
            }
            return sum;
        }
        console.log('3的阶乘累加和是'+getSum(3));
    </script>
</body>
</html>