JS-练习题

1      function foo() {
2             bar.apply(null, arguments);
3         }
4         function bar(){
5             console.log(arguments);
6         }
7 
8         foo(1,2,3,4,5);

结果：（1，2，3，4，5）

1 function b(x, y, a){
2             arguments[2] = 10;
3             alert(a);
4         }
5         b(1, 2, 3);

结果：10

1 var f = (
2             function f(){
3                 return "1";
4             },
5             function g(){
6                 return 2;
7             }
8         )();
9         typeof f;

结果；"number"
逗号运算符：（x，y），输入结果是：两个值进行比较，谁大输出谁

1 var x = 1;
2         if (function f(){}) {
3             x += typeof f;
4         }
5 console.log(x);

结果："1undefined"

 var num = (function(n){
            if (n == 1){
                return 1;
            }
            return n * arguments.callee(n-1);
        }(100))

1 var foo = ‘123‘;
2         function print(){
3             var foo = ‘456‘;
4             this.foo = ‘789‘;
5             console.log(foo);
6         }
7         print();

结果：456

1  var foo = ‘123‘;
2         function print(){
3             this.foo = ‘789‘;
4             console.log(foo);
5         }
6         print();

结果：789

1  var foo = ‘123‘;
2         function print(){
3             this.foo = ‘789‘;
4             console.log(foo);
5         }
6    new print();

结果：123

 1    var bar = {a: "002"};
 2         function print(){
 3             bar.a = ‘a‘;
 4             Object.prototype.b = ‘b‘;
 5             return function inner() {
 6                 console.log(bar.a);
 7                 console.log(bar.b);
 8             }
 9         }
10         print()();

结果：a   
     b