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This article mainly explains "what are the javascript topics". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "what are the javascript topics"?

1, the running result of the following expression is:

["1", "2", "3"] .map (parseInt)

A. ["1", "2", "3"]

B. [1,2,3]

C. [0,1,2]

d. Other

2, the running result of the following expression is:

[typeof null, null instanceof Object]

A. ["object", false]

B. [null,false]

C. ["object", true]

d. Other

3, the running result of the following expression is:

[[3Jing 2 Jing 1] .reduce (Math.pow), [] .reduce (Math.pow)]

a. Error

B. [9,0]

C. [9,NaN]

D. [9,undefined]

4, the running result of the following expression is:

Var val = 'value'

Console.info ('Value id' + (val = = 'value')?' Something':'Nothing')

A.Something

B.Nothing

C.NaN

d. Other

5, the running result of the following expression is:

Var name = 'World'

(function () {

If (typeof name = = 'undefined') {

Var name = "Jack"

Console.info ('Goodbye' + name)

} else {

Console.info ('Hello' + name)

}

) ()

A.Goodbye Jack

B.Hello Jack

C.Goodbye undefined

D.Hello undefined

6, the running result of the following expression is:

Var START = END-100

Var count = 0

For (var I = START; I 0

A.true

B.false

c. Error

d. Other

23, the running result of the following expression is:

[1

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