JS array processing

A. Define an array:

Method 1

var mycars=new Array (); mycars[0]= "Saab"; Mycars[1]= "Volvo"; mycars[2]= "BMW";

Method 2:

var mycars=new Array ("Saab", "Volvo", "BMW");

Method 3.

var mycars=["Saab", "Volvo", "BMW"];

Two. Array modification using for loop traversal

① in the array to specify the worthy location

var x=mycars.length        //Array length Y=mycars.indexof ("Volvo")  //a worthy location

② merging Arrays concat ()

var hege = ["Cecilie", "Lone"];var stale = ["Emil", "Tobias", "Linus"];var children = hege.concat (stale);

③ Array to string ToString () or join () "Join can arbitrarily set the interval character ToString no"

var fruits = ["Banana", "Orange", "Apple", "Mango"];var t =fruits.join ("--");

Results: Banana--orange--apple--mango

④:slice ()//The original array did not change

var fruits = ["Banana", "Orange", "Lemon", "Apple", "Mango"];var citrus = fruits.slice (1,3),//1 is the length of index 3

Results: Orange,lemon

⑤:splice ()//change the original array directly

var fruits = ["Banana", "Orange", "Apple", "Mango"];fruits.splice (2,0, "Lemon", "Kiwi"), change the original array directly

Results: Banana,orange,lemon,kiwi,apple,mango

JS array processing