js--the difference between arrays, = =, and = =

How to create an array:

1)

<script type= ' text/javascript ' >    varnew Array (1,2,3,4, ' abc ', 3)</script >

2) (this is actually used in many, high efficiency)

<scripts type= ' text/javascript ' >    var aRr02 = [All-in-all, ' SD ']; </script>

Operation:

1) Gets the number of members of the array:

Aleart (Arr02.length)

2) Popup array contents (PIN starting from 0)

Aleart (Arr02[3])

3) Connection string: Join ()

var str1 = Arr02.join ("-")var str2 = Arr03.join ("")

4) Add Delete member from the back of the array: Push (), pop ()

Arr02.push ("a")
Arr02.pop ();

5) Add Delete member from front of array: Unshift (), Shift ()

Arr02.unshift (' a '); Arr02.shift ();

6) Invert the array: reverse ()

Arr.reverse ();

7) Returns the index value of the first occurrence in the array element: IndexOf ()

var aRr2 = [' A ', ' B ', ' C ', ' d ', ' A ', ' B ', ' C ', ' d ' ]; var num = arr2.indexof (' B '); alert (num); // pop up 1

8) Add or remove elements from the array: Splice ()

Arr2.splice (2,1); alert (ARR2)// start deleting 1 elements from the subscript 2 element

Arr2.splice (2,1, ' e '); alert (ARR2)//start by deleting 1 elements from subscript 2 and inserting e into the element labeled 2 here

Two-dimensional arrays:

var aRr03 =[[1,2,3],[' A ', ' a ', ' d '],[true]]

The difference between = = and = = =:

= = Two data to be compared before being judged equal to the same data type

= = = Does not convert the data type, directly compared, if the data type is different, then this judgment must be unequal.

js--the difference between arrays, = =, and = =