how to use foreach in javascript

remember them correctly. Similar to the following methods, such as $.map. var arr = [1,2,3,4]; var res= arr.foreach (function (Value,index,array) {Array[index] = value*4;}); Console.log (arr); The result is [4,8,12,16]console.log (res); Undefinedmap:map is the meaning of "mapping" similar to the use of ForEach, which is: [].map (function (Value,index,array) {//code}) var ary = [12,23,24,42,1]; var res = Ar

1. js array looping. Array loop variables, the first thought of is for (VAR I = 0; I In addition, you can also use a relatively simple foreach method. 2. foreach function. Both the array type of Firefox and chrome have foreach functions. Use: However, the above Code cann

to point to the this reference of the callback function. This can sometimes be useful, for example, when we want to use the method of an object as a handler for the Foreach function:var database = {users: ["Csser", "John", "David"], sendemail:function (user) {if (this.isvaliduser (user)) {/* Send message */}}, Isvaliduser:function (user) {/* Verify code */}}; Send a message to each user Under simple an

JavaScript is a literal-translation scripting language, which is a dynamic type, a weak type, a prototype-based language, and a built-in support type. Its interpreter, known as the JavaScript engine, is widely used as a scripting language for the client, and is used in HTML (an application under the standard Universal markup Language) to add dynamic functionality to an HTML web Page.JavaScript has been in e

The use of foreach is often used in PHP, and if you use foreach, you must use an array. So in this article, we talk about the array, and we're talking about foreach. foreach has two ki

This article mainly introduces the differences between the forin loop of js and the foreach loop in java. The example analyzes the use skills of the forin loop of js and explains the differences between the use of the foreach loop and that of Java, it has some reference value. If you need it, you can refer to the examp

foreach is a method of manipulating an array in ES5, and the main function is to iterate through the array, for example:var arr = [1,2,3,4];arr.foreach (alert); equivalent to:var arr = [1, 2, 3, 4]; for (var k = 0, length = arr.length; k ) {alert (array[k]);}The function callback in the Foreach method has three parameters: the first argument is the array contents of the traversal, the second parameter is t

foreach is a method of manipulating an array in ES5, and the main function is to iterate through the array, for example:1 var arr = [1,2,3,4]; 2 Arr.foreach (alert);Equivalent to:1 var arr = [1, 2, 3, 4]; 2 for (var k = 0, length = arr.length; k ) {3 alert (array[k]); 4 }The function callback in the Foreach method has three parameters: the first argument is the array contents of the traversal, the second

name that you can use to access the loop. Use the method {$smarty. Foreach.foreachname.varname}, where Foreachname is the Name property specified in foreach. foreach Demo {* This example will output the value of all elements in the array $custid *} Copy Code code as follows: {

for IE support: Https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/forEach if (! Array.prototype.forEach) {Array.prototype.forEach = function (callback, thisarg) {var T, K; if (this = null) {throw new TypeError ("This is a null or not defined"); } var O = Object (this); var len = o.length >>> 0; Hack to convert O.length to a UInt32 if

+ ":" + el );}// A: a \ n B: B \ n c: cForEach ({a: 'A', B: 'B', c: 'C'}, print );// 1: Stupid \ n 2: egg \ n 3: \ n 4: Seat \ n 5: right \ n 6: MingForEach ("stupid motto", print );Function Person (name, age ){This. name = name | "";This. age = age | 0;};Person. prototype = new Person;Var fred = new Person ("jxl", 22 );Fred. language = "chinese"; // bind very late// Name: jxl \ n age: 22 \ n language: chineseForEach (fred, print ); Note: The index parameter subscript In the callback function s

JavaScript is a literal translation script language, a dynamic type, a weak type, a prototype based language, and a built-in support type. Its interpreter, known as the JavaScript engine, is widely used as a scripting language for clients, and is used in HTML (an application under standard Universal Markup Language) to add dynamic functionality to HTML Web pages. JavaS