Array Common APIs

Push: Trailing add
Grammar:
Arr.push ();
Return value: The length of the array after the data has been added
Change Element Group

    var arr = [10,20,30,40];    var newArr = Arr.push (50);    Console.log (Arr,newarr);    Unshift: Header Add Syntax: Arr.unshift ();    Return value: The length of the array after adding the data will change the original array var arr = [10,20,30,40];    var newArr = Arr.unshift (50);            Console.log (Arr,newarr);    Pop: Trailing delete syntax: Arr.pop () Delete is a return value that does not need to pass parameters: the deleted data will change the original array var arr = [10,20,30,40];    var newArr = Arr.pop ();    Console.log (Arr,newarr);    Shift: Header deletion syntax: arr.shift () Delete is a return value that does not need to pass parameters: the deleted data will change the original array var arr = [10,20,30,40];    var newArr = Arr.shift (10);    Console.log (Arr,newarr);    Reverse: Inversion Syntax: Arr.reverse ();    Return value: Inverse of the array will change the original array var arr = [10,20,30,40];    var newArr = Arr.reverse ();    Console.log (Arr,newarr);        Sort (): Sorting---> Interview basically all the grammar: Arr.sort ();        1, Arr.sort ();         If the data in the array is less than 10, it can be sorted as normal var arr = [9,4,8,2,7,3];         var newArr = Arr.sort ();         Console.log (Arr,newarr); When a parameter is not passed in sort, it is sorted by ASCII code 2, sortPass parameter Arr.sort (function (A, b) {return a-A;             }) var arr = [9,14,8,21,7,31];             var newArr = Arr.sort (function (A, b) {return b-a;        }) Console.log (NEWARR);        3. mixed row var arr = [10,20,30,40,50,60,70];        var newArr = Arr.sort (function () {return 0.5-math.random (); }) Console.log (arr) */concat (): Array of spliced arrays. Concat (array) The return value is a concatenation after the new array does not change the original array var arr = [10,20,30];var arr1 = [40,50,60];va R NEWARR = Arr.concat (arr1); Console.log (Arr,arr1,newarr); join: Converts an array to a string var arr = [10,20,30];var str = Arr.join ("!"); Console.log (ARR,STR); The return value is a converted string that can pass characters without altering the original array split: convert string to array var str = "another parting"; var arr = Str.split (""); Console.log (Str,arr); ToString (): Converts an array to a string var arr = [10,20,30,40,50];var str = arr.tostring ();//Check toString usage//tostring () The return value of the function is of type string. Returns the string form of the current object.    Console.log (ARR,STR); slice: Array intercept delete start: Intercept start position end: Intercept end position (optional)//left closed right open var arr = [10,20,30,40,50]; VarNEWARR = Arr.slice (2,5);    Console.log (Arr,newarr); The original array did not change splice: array interception can be inserted to replace delete start: Add or remove the starting position subscript the second value: if 0 is the case of adding a non-0 case is to delete the number of deleted or added third value: The number to be added or removed (optional); If the second parameter is not 0 The case is replaced, the return value is replaced by the data, the original array is changed after the data will change the original array var arr = [10,20,30,40,50,60,70];var newArr = Arr.splice (1,0,5); Co Nsole.log (Newarr,arr)

Array Common APIs