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让人蛋疼的JavaScript语法特性

时间:2024-3-2 06:20     作者:韩俊     分类: Javascript


在知乎上看到的有人发布的和javascript有关的试题,和大家分享下,虽然是N久前的事了,但这些题相当经典,不免让人觉得javascript真是门蛋疼的语言。

1.

(function () { 

        return typeof arguments; 

    })();

A. "object" B. "array" C. "arguments" D. "undefined"

答案:A

2.

var f = function g() {

                return 23;

            };

        typeof g();

A. "number" B. "undefined" C. "function" D. Eorror

答案:D

3.

(function (x) {

            delete x;

            return x;

        })(1);

A. 1 B. null C. undefined D. Error

答案:A

4.

var y = 1,

        x = y = typeof x;

        x;

A. 1 B. "number" C. undefined D. "undefined"

答案:D

5.

(function f(f) {

            return typeof f();

        })(function () {

            return 1;

        });

A. "number" B. "undefined" C. "function" D. Error

答案:A

6.

var foo = {

            bar: function () {

                return this.baz;

            },

            baz: 1

        };

        (function () {

            return typeof arguments[0]();

        })(foo.bar);

A. "undefined" B. "object" C. "number" D. "function"

答案:A

7.

var foo = {

            bar: function () {

                return this.baz;

            },

            baz: 1

        };

        typeof (f = foo.bar)();

A. "undefined" B. "object" C. "number" D. "function"

答案:A

8.

var f = (function f() {

            return "1";

        }, function g() {

            return 2;

        })();

        typeof f;

A. "string" B. "number" C. "function" D. "undefined"

答案:B

9.

var x = 1;

 if (function f() {}) {

 x += typeof f;

 }

 x;

A. 1 B. "1function" C. "1undefined" D. NaN

答案:C

10.

var x = [typeof x, typeof y][1];

        typeof typeof x;

A. "number" B. "string" C. "undefined" D. "object"

答案:B

11.

(function (foo) {

            return typeof foo.bar;

        })({

            foo: {

                bar: 1

            }

        });

A、“undefined” B、“object” C、“number” D、Error

答案:A

12.

(function f() {

            function f() {

                return 1;

            }

            return f();

            function f() {

                return 2;

            }

        })();

A、1 B、2 C、Error (e.g. “Too much recursion”) D、undefined

答案:B

13.

function f() {

        return f;

    }

    new f() instanceof f;

A、true B、false

答案:B

14.

with (function(x, undefined){}) length;

A、1 B、2 C、undefined D、Error

答案:B

15.

以下哪条语句会产生运行错误:()          

A.var obj = ();           

B.var obj = [];        

C.var obj = {};        

D.var obj = //;

答案:A

标签: javascript

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