Js递归

//必须要有if判断进行出栈，不然会进行死循环
<script>
    function factorial(n) {
        if (n == 1) return n;
        return n * factorial(n - 1)
    }
    console.log(factorial(5)) // 5 * 4 * 3 * 2 * 1 = 120
</script>