Several methods used in arrays

Push: Adding a return value to the end of the array is the new length of the array

Unshift: Adding a return value to the beginning of the array is the new length of the array
Pop: Delete the end item of an array the return value is a deleted array item
Shift: Delete Array start item returns the beginning item that was deleted
Splice: Deleting any item in an array returns a value that is a deleted array item
Slice: Copy array return value is copied to the new array after the value is written does not contain the last item being copied

Stitching:
Concat: Stitching an array together with another array to return a well-stitched array
Join: Stitch Each item in the array into a string by the specified delimiter

Sort:
Reverse: Reverse Array return value reverse array original array change
Sort: Bubble sort based on anonymous function b-a reverse A-B ascending

Poor compatibility:
INDEXOF: Returns the index of the get item in the array
LastIndexOf: Returns the last index that gets the item that appears in the array
ForEach: Looping through an array parameter is an anonymous function returned by default to undefined
Map: Looping through an array parameter is an anonymous function

On the code:

var ary = [1,2,3,4,5,6,7,8,9,0];    var ary1=[1,5,7,4];    var ary2=[2,3,4,5,7,3,4,5];    var a=ary.splice (2,3,5);//delete any of the items in the array can be extended to push,unshift,pop,shift,slice most commonly used var b=ary.splice (2,1);    /*var a= "Test";            var b=[123]; Used for the foreach Test */var C=ary.push (1);//Add a var d=ary.unshift (3) at the end of the array;//Add a var e=ary.pop () at the beginning of the array;//delete an item at the end of the array V Ar f=ary.shift ();//Delete a var g=ary.slice (2,5) at the beginning of the array;//copy array var h=ary.concat (Ary1,ary2). Concat (1,2,2,2,2,[456654]); If there is no parameter or the parameter is () NULL, the assignment array is var i=ary.join (' + ');//each item in the array is spliced with the specified delimiter into a new string Var j=ary.reverse ();//Reverse sort the original array to change Var k=    Ary1.sort (function (A, b) {return b-a;}); var l=ary2.indexof (4);//Returns the index that gets the item that appears in the array var m=ary2.lastindexof (4);//Returns the last index that gets the item in the array var n=ary2.indexof (9);//If the Get item is not    Present returns-1 Var o=ary.foreach (function (A, b) {Console.log (A, A, b)});    var p=ary2.map (function () {});    Console.log (a);    Console.log (b);    Console.log (c);    Console.log (d);    Console.log (e);    Console.log (f);    Console.log (g); ConsoLe.log (h);    Console.log (i);    Console.log (j);    Console.log (k);    Console.log (l);    Console.log (m);    Console.log (n);//Console.log (A,XB);    Console.log (o);    Console.log (ary); Console.log (Ary1);

Splice's expanded use:
Analog Push   Ary.splice (ary.length,0,x)
Analog pop    Ary.splice (ary.length-1,1)
Analog Unshift   Ary.splice (0,0,x)
Analog shift     Ary.splice (0,1)
Splice (0) from 0 to the end ==> all deleted operations ==> return all array items ==> cloned array

Several methods used in arrays