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别人网下的js不错题,很有技术题,小弟我只暂存,慢慢看

热度:192   发布时间:2012-09-22 21:54:54.0
别人网上的js不错题,很有技术题,我只暂存,慢慢看
01


(function () { 
    return typeof arguments; 
})(); 

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

02


var f = function g() {
        return 23;
    };
typeof g();

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

03


(function (x) {
    delete x;
    return x;
})(1);

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

04


var y = 1,
    x = y = typeof x;
x;

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

05


(function f(f) {
    return typeof f();
})(function () {
    return 1;
});

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

06


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

07


var foo = {
    bar: function () {
        return this.baz;
    },
    baz: 1
};
typeof (f = foo.bar)();

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

08


var f = (function f() {
    return "1";
}, function g() {
    return 2;
})();
typeof f;

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

09


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
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