匿名函数递归(arguments.callee)和命名函数递归

匿名函数递归

1 function factorial(num) {
2             if (num <= 1) {
3                 return 1;
4             } else {
5                 return num * arguments.callee(num - 1);
6             }
7         }

命名函数递归

1 function factorial(num) {
2             if (num <= 1) {
3                 return 1;
4             } else {
5                 return num * factorial(num - 1);
6             }
7         } 

调用函数

1 var trueFactorial = factorial;

2         factorial = function () {
3             return 0;
4         };
5         console.log(trueFactorial(5));
6         console.log(factorial(5));