1.

var foo = function foo() {

    console.log(foo === foo); 

};

foo();

2.

Number("1") - 1 == 0;

3.

(true + false) > 2 + true;

4.

function bar() {

    return foo;

    foo = 10;

    function foo() {}

    var foo = ‘11‘;

}

alert(typeof bar());

5.

"1" - - "1";

6.

var x = 3;

var foo = {

    x: 2,

    baz: {

        x: 1,

        bar: function() {

            return this.x;

        }

    }

}

var go = foo.baz.bar;

alert(go());

alert(foo.baz.bar());

7.

new String("This is a string") instanceof String;

8.

[] + [] + ‘foo‘.split(‘‘);

9.

new Array(5).toString();

10.

var myArr = [‘foo‘, ‘bar‘, ‘baz‘];

myArr.length = 0;

myArr.push(‘bin‘);

console.log(myArr);

11.

String(‘Hello‘) === ‘Hello‘;

12.

var x = 0;

function foo() {

    x++;

    this.x = x;

    return foo;

}

var bar = new new foo;

console.log(bar.x);

13.

"This is a string" instanceof String;

14.

var bar = 1,

    foo = {};

foo: {

    bar: 2;

    baz: ++bar;

};

foo.baz + foo.bar + bar;

15.

var myArr = [‘foo‘, ‘bar‘, ‘baz‘];

myArr[2];

console.log(‘2‘ in myArr);

16.

var arr = [];

arr[0]  = ‘a‘;

arr[1]  = ‘b‘;

arr.foo = ‘c‘;

alert(arr.length);

17.

10 > 9 > 8 === true;

18.

function foo(a, b) {

    arguments[1] = 2;

    alert(b);

}

foo(1);

19.

NaN === NaN;

js题集5