解題思路:
(1)注意typeof和null的使用
function fizzBuzz(num) {
if(num%3 == 0 && num%5 == 0)
return "fizzbuzz";
else if(num%3 == 0)
return "fizz";
else if(num%5 == 0)
return "buzz";
else if(num == null || typeof num != "number")
return false;
else return num;
}