Super-useful JavaScript library for new projects

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Implementation of JavaScript object-oriented inheritance

1Implementation of JavaScript object-oriented inheritance

Type detection in JavaScript

JavaScript is loosely typed, that is, before you use variables and function parameters, they are not compared to ensure that their data types are correct. JS has five basic data types: Undefined, Null, Boolean, number, and string, as well as a

45 essential JavaScript Web development tools

JavaScript is a flexible scripting language that is widely used throughout the world in Web pages and server applications. You can use it for any purpose, but you need some tools. Fortunately, in order to accomplish a unique task, the count-free

javascript--Array of reference types

PrefaceBefore this dish was intended to write a reference type object after writing the base type, because object is the basis of a reference type, and other reference types are also based on object. Just the basic understanding of the object and

The language of JavaScript learning notes

A. In usage For...inEnumerates all enumerable properties of an object Detecting Dom/bom Propertiesif ("onclick" in Elem) { //element supports Onclick}if ("onerror" in window) { //window supports onerror} Detecting the

JavaScript writes a piece of code that determines the most frequently occurring string in a string and counts the number of occurrences

JavaScript writes a piece of code that determines the most frequently occurring string in a string and counts the number of occurrences1 functionTest () {2 varBT = document.getElementById ("BT"));3Bt.addeventlistener ("click",function(){ 4 5

Beginner 107 Common JavaScript statements

1.document.write (""); Output statementThe comments in the 2.JS are//3. Traditional HTML Document order is: document->html-> (head,body)4. The DOM order in a browser window is: window-> (navigator,screen,history,location,document)5. Get the name and

JavaScript eval () function

definition and Usage:the eval () function computes a string and executes the JavaScript code in it.Syntax:eval (String) Parameters Description String Necessary. The string to evaluate that contains the

Summary of the main points of the JavaScript apocalypse

Preface: This article is reading "JavaScript revelation" after a reading note, the main points of the book is a summary, not the original content Oh. To learn more about the content, read the original book. Objects are made up of named

A brief history of JavaScript, 20 years of browser

A long time ago there was no yahoo,google .... People are still using 28.8KBIT/S's "cat" Internet access, the user registration or login when all the authentication is in the server authentication, if the user registration when the user name or

The EventLoop understanding in JavaScript

Original from ruanyifeng.comA year ago, I wrote an article, "What is Event Loop?" , and talked about my understanding of the event loop.Last month, I happened to see Philip Roberts's speech, "Help, I ' M stuck in an Event-loop". It is only

Javascript-string Object Regular Match

String Object Regular Matchhtml>head>meta http-equiv="Content-type" Content="text/html; Charset=utf-8 ">title>Insert Title heretitle>script type="Text/javascript"> varStr="hell21o worl345d!";varreg=/\d{4,}/;//alert (Reg.test (str));

JavaScript closure in-depth analysis and implementation method

1, what is the closure of the packageClosures, the official explanation for closures is that an expression (usually a function) with many variables and environments that bind these variables is also part of the expression. Features of closures:1. As

JavaScript notes and summaries (2-3) JavaScript operators, control structures, and object operations

" Join operator +" Output:3a34The logical operator returns the first value that can determine the result of an expressionExample ①Output:10NumberExample ②Output:TrueBooleanOften used in some frameworks | | To do browser compatibility, form: WINDOW.A

Js/javascript Code Comment Specifications and examples

Note In the code writing process of importance, write code more than half a year can be deeply realized. Code that is not annotated is not a good code. For others to learn, at the same time for their own later to the code "upgrade" to see the

JavaScript's built-in object's global object

The built-in objects are defined as:Provided by the JavaScript implementation and not created by yourself, these objects already existed before the ECMAScript program was executed.This means that developers do not have to instantiate the built-in

JavaScript Advanced Programming Application

One//various sizes (size)s + = "\ r \ n page Visible area width:" + document.body.clientWidth;s + = "\ r \ n page visible Area High:" + document.body.clientHeight;s + = "\ r \ n page visible Area High:" + Document.body.offsetWeight + "(including

Understanding of the This keyword for nested functions in JavaScript

As we all know, in a method invocation, this refers to the object to which the method belongs, such as the following code:Obj.test (Console.log (this// returns TrueHowever, in nested functions, the situation has changed a lot. This needs to be

JavaScript implements custom events for custom objects

Objective:As you know, using JavaScript makes it easy to use the AddEventListener function to quickly bind a DOM object to one or more event listeners.How do we use this method in JavaScript custom objects and trigger events? This is the core of

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