JS Create an array of simple methods _javascript tips

1. Method of declaring array

(1): Arrayobj = new Array (); Creates an array.

The code is as follows:

var arr1 = new Array ();

(2): Arrayobj = new Array ([size])
creates an array and specifies the length, not the upper limit, but the length.

The code is as follows:

var a = new Array (5);

(3): Arrayobj = new Array ([element0[, element1[, ...)　[, ELEMENTN]]]
creates an array and assigns a value.

The code is as follows:

var a = new Array (["B", 2, "a", 4,]);

(4): Arrayobj = [Element0, Element1, ..., ELEMENTN]
create an array and assign a value shorthand, note that the brackets here do not indicate that it can be omitted.

The code is as follows:

var a = ["B", 2, "a", 4,];

(note): Note the difference between "[]" and "[]"

The code is as follows:

var a = new Array (5); The creation of an array of length 5,
var a = new Array ([5]), or the creation of an array with a length of 1 and a first digit of 5

2. Common methods of arrays

3. The operation of the array (send address)

The code is as follows:

var t2=new Array ();
T2[0]=1;
t2[1]=2;
Test2 (T2); Pass address (array)

function test2 (var2) {for
(var i=0;i
var2[i]=var2[i]+1;
}
}
for (Var i=0;i
alert (t2[i]);
}

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