freecodecamp javascript

This tutorial provides a relatively complete basic knowledge for those who have not been familiar with JavaScript, but only limited to the basic knowledge. JavaScript reference This tutorial provides a relatively complete basic knowledge for those who have not been familiar with JavaScript, but only limited to the primary knowledge: All

In millions of pages, JavaScript is used to improve design, validate forms, detect browsers, create cookies, and so on. Javascript is the most popular scripting language on the Internet and can run in all major browsers, such as Internet Explorer, Mozilla, Firefox, Netscape, and opera.Basic knowledge you should possess: Before continuing to learn, you should have a basic understanding of the following: Ht

Introduction to the programming language JavaScript, the programming language javascript What is JavaScript? JavaScript is a scripting language widely used in client web pages (browsers) development. It is used to add dynamic functions to HTML web pages, such as responding to various user operations.

JavaScript is a programming language. Syntax Rules define the language structure. JavaScript syntax JavaScript is a programming language. Syntax Rules define the language structure. JavaScript syntax JavaScript is a scripting language. It is a lightweight but powerful progra

After being used to OOP programming, I will find many strange and strange phenomena (such as closures) in the Javascript world. I spent a lot of energy studying the root of these strange phenomena and finally found: the scope originated from javascript is not block-level scope, and it also has a set of scope-chain-based identification lookup mechanism. Most of the content in this article comes from the Inte

JavaScript can be used to verify the input data in the HTML form before the data is sent to the server. The typical form data verified by JavaScript includes: Have you entered required items in the form?Is the email address entered by the user valid?Have you entered a valid date?Does the user input text in the data field (numeric field?Required (or required) project The following function is used to check

A reference type is a data structure used to organize data and functions together. This article mainly introduces the reference type of JavaScript tutorials. Reference Type A reference type is a data structure used to organize data and functions together. It is also often called a class, but this name is not appropriate. Although ECMAScript is technically an object-oriented language, it does not have basic structures such as classes and interfaces su

When JavaScript is used on pages, where should these JS Code be placed? Next, let's learn how to use JavaScript on the page. Where should these JS Code be put? Let's take a look. Generally, there are two ways to write on the interface and use. js files. 1.1 Head part on the Interface You can directly put it in the head label, as shown in the following code: TestPage

The condition statements in JavaScript are used to complete behaviors based on different conditions.Instance Switch statement How to compile a switch statement. Javascript switch statement If you want to execute one of several code blocks, you can use the switch statement:Syntax: switch(n){case 1:Execution Code Block 1break case 2:Execution Code Block 2break default:If n is neither 1 nor

Javascript has a bad reputation on the Internet, however, it is hard for you to find another language that is so dynamic, widely used, and rooted in our lives. Its low learning threshold is called by many people. it is a pre-school scripting language, another thing that makes people laugh at is that the concept of Dynamic Language is to use a high standard of static data types. In fact, you and Javascript b

Basic javascript programming handler variables, objects, data types and functions, javascript In web standards, a webpage consists of three parts: structure, representation, and behavior. Structure standard ----> XHTML; Standard Format -----> CSS; Behavior standard -----> javascript; Javascript is a programming languag

technically , mobile apps on ios,Android and Windows Phone are developed in different programming languages, and iOS apps use Java with Objective-c,android apps, and The Windows Phone app Uses. NET. 。 With the improvement of JAVASCRIPT,CSS and HTML knowledge, You can also build a fantastic mobile app. In this blog post, we will introduce some excellent JavaScript mobile application development frameworks.Wh

This article explains the this keyword in JavaScript using the image explanation. What does JavaScriptthis point? You can get the desired answer from this article. For more information, see JavaScript as a scripting language. It supports functional programming, closures, prototype-based inheritance, and other advanced functions. JavaScript seems to be easy to get

In-depth analysis of the creation of objects in Javascript this small series is the most popular in my blogArticleSome bloggers urged me to finish my next article. Yesterday and today I found that an article could not finish my next half, so I divided the next article I was going to write into two parts. In the previous article of this topic, I talked about three ways to create objects. Finally, I understood how to create

When Xi first came into contact with JavaScript, My friend asked: what have you done recently? I replied: I learned the Java scripting language. For this reason, I have been sweating ...... @ As a matter of fact, JavaScript and Java are not built at all. Later I saw a book and realized that JavaScript is prefixed with "Java-", which is completely a marketing st

Sometimes, when writing JavaScript to Your webpage, you need to decide whether to use an existing available JavaScript library or write all the code by yourself. Each of them has its own advantages and disadvantages, so no method is absolutely correct for everyone. You must decide which of the two methods to write your JavaScript code. To help you make a wise dec

[JavaScript tutorial] JavaScript usage JavaScript usage The script in HTML must be located between the script tag and the script tag. Scripts that can be placed on HTML pagesAnd. Script tag To insert JavaScript into the HTML page, use the script tag. Script and script tell JavaScri