how to use foreach in javascript

Use c: forEach to control 5 line breaks and foreach line breaks When I was working on a project today, I encountered a problem. I needed to display images of uncertain numbers on the webpage (the images were retrieved from the database). I used the Note: status. count indicates the number of iterations of the current iteration starting from 1. A: How can struts

The following small series will introduce you to the array traversal forEach () and map () methods in JavaScript and the compatible writing method. I think it is quite good. Now I will share it with you and give you a reference. Let's take a look at it with xiaobian. • Principle: • Advanced browsers support the forEach Method Syntax: Both

()method does not return execution results, but instead undefined . In other words, forEach() the original array is modified. Instead, map() the method gets a new array and returns.ExampleAn array is provided below, and if we want to double each of these elements, we can use map and forEach to achieve the goal. Let arr = [5]; ForeachNot

) { return false; } Alert (index+ ":" +el); }); function Print (El,index) { Alert (index+ ":" +el); } A:A \ b:b \ C:c ForEach ({A: ' A ', B: ' B ', C: ' C '},print); 1: Stupid 2: Eggs \ n 3: \ n 4: Block \ n 5: Right \ n 6: Ming ForEach ("Idiot's motto", print); function person (name, age) { this.name = Name | | ""; This.age = Age | | 0; }; Person.prototype = new Person; va

1. js Array loop traversal.Array loop variables, the first thing to think about is the for (Var i=0;iIn addition, a simpler foreach method can be used2. The ForEach function.Both Firefox and Chrome's array types have a foreach function. Use the following:[HTML]View Plaincopy > HTML> HEAD> title> New Docu

1. js array looping. Array loop variables, the first thought of is the for (vari0; I lt; count; I ++) method. In addition, you can also use the relatively simple forEach method 2. forEach function. The Array types of Firefox and Chrome both have forEach... SyntaxHighlig 1. js Array traversal. Array loop variable, firs

The array methods in the ECMA Script5 such as indexof (), ForEach (), map (), filter (), some () do not support ie6~8, but there is still a large majority of users in the country using Ie6~8, and the above array method is really useful. In the past, I would try not to use these methods for compatibility. But you can't lose a new one for the old one. Although jquery has been integrated with a lot of grammati

1. js Array loop traversal. array loop variable, the first thing to think about is the for (Var i=0;i In addition, you can use a simpler foreach method 2. The ForEach function.Both Firefox and Chrome's array types have foreach functions. Use the following: But above, th

,arrayy) {...})But for NodeList to use the following notation.[].foreach.call (Lists,function (Valule.index.arrayy) {...})Why can ' t I use ForEach or map on a NodeList?NodeList is used very much like arrays and it would is tempting to use array.prototype methods on them. This is, however, impossible.JavaScript has a i

1.js Array loop traversal. Array loop variable, the first thing to think about is the for (Var i=0;i In addition, you can use a simpler foreach method 2.forEach function. Both Firefox and Chrome's array types have foreach functions. Use the following: But a

The two methods seem to have something to do with the name, but the difference between them is quite large in JavaScript.foreach () is used for the operation of an array, which executes the established function for each element in an array (not arrays cannot use the foreach () method). and $.each () is a method in jquery that executes the function that is developed for each matching element in the collectio

) {Array.prototype.forEach=function(callback, Thisarg) {varT, K; if( This==NULL) { Throw NewTypeError ("This is a null or not defined"); } varO = Object ( This); varLen = o.length >>> 0;//Hack to convert O.length to a UInt32 if({}.tostring.call (callback)! = "[Object Function]") { Throw NewTypeError (callback + "is not a function"); } if(thisarg) {T=Thisarg; } k= 0; while(K Len) { varKvalue; if(kinchO) {Kvalue=O[k]; Ca

1. js Array loop traversal.Array loop variables, the first thing to think about is the for (Var i=0;iBoth Firefox and Chrome's array types have a foreach function. Use the following:But the above, the code in IE does not work properly.Because the array of IE does not have this methodThe implementation of the above sentence is "undefined", that is, in IE, the Array does not have a

+": "+ El ); } foreach ({A: 'A', B: 'B ', c: 'C'}, print); // 1: Stupid \ n 2: egg \ n 3: \ n 4: Seat \ n 5: right \ N 6: Ming foreach ("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"; // late binding // name: jxl \ n age: 22 \ n language: Chinese