What language is JavaScript?
Javascript is a cross-platform interpreted, dynamically typed, weakly typed, prototype-based scripting language. JavaScript is a network scripting language that has been widely used in web application development. It is often used to add various dynamic functions to web pages to provide users with smoother and more beautiful browsing effects. JavaScript code cannot run independently. Generally, you need to use script tags to place it in HTML and run it with the help of the browser environment.
The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.
What language is javascript
JavaScript is a dynamically typed, weakly typed, prototype-based scripting language. Its interpreter is called the JavaScript engine, which is part of the browser and is widely used in client-side scripting languages. It was first used on HTML web pages to add dynamic functions to HTML web pages.
JavaScript is a network scripting language that has been widely used in Web application development. It is often used to add various dynamic functions to web pages to provide users with smoother and more beautiful browsing effects. Usually JavaScript scripts realize their functions by embedding them in HTML.
JavaScript is a cross-platform interpreted language that does not require pre-compilation and can run under various operating systems.
JavaScript has the following characteristics:
1) Interpreted scripting language
JavaScript is an interpreted scripting language, similar to C, C and other languages Different from needing to compile before running, code written in JavaScript does not need to be compiled and can be run directly.
2) Object-oriented
JavaScript is an object-oriented language. Using JavaScript, you can not only create objects, but also operate and use existing objects.
3) Weak type
JavaScript is a weakly typed programming language that does not have strict requirements on the data type used. For example, you can initialize a variable to any type, or you can initialize it at any time. Change the type of this variable.
4) Dynamic
JavaScript is an event-driven scripting language that can respond to user input without the help of a Web server. For example, when we visit a web page , when you click on a web page with the mouse or scroll the window, you can directly respond to these events through JavaScript.
5) Cross-platform
JavaScript does not depend on the operating system and can run in the browser. Therefore, after a JavaScript script is written, it can be run on any system, as long as the browser on the system supports JavaScript.
Run JavaScript code
JavaScript programs cannot run independently and can only be executed in the host environment. Under normal circumstances, JavaScript code can be placed in the web page and run with the help of the browser environment.
Embedding JavaScript scripts in HTML pages requires the use of the <script> tag. Users can directly write JavaScript code in the <script> tag</script>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>JavaScript程序</title>
<script type="text/javascript">
document.write("<h1 id="PHP中文网-https-www-php-cn">PHP中文网：https://www.php.cn/</h1>");
</script>
</head>
<body></body>
</html>
You can also place JavaScript code in a JavaScript script file. JavaScript script files are text files with the extension .js and can be edited using any text editor. JavaScript files can then be imported into HTML pages using the <script> tag. </p><p>Example: <br/></p><p>Write the following JavaScript code in the test.js file. <br/></p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>alert("PHP中文网：https://www.php.cn/");</pre><div class="contentsignin">Copy after login</div></div><p>Insert a <script> tag within the <head> tag of the HTML document. Define the src attribute and set the attribute value to a URL string pointing to an external JavaScript file. The code is as follows: <br/></p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'><script type="text/javascript" src="test.js"></script></pre><div class="contentsignin">Copy after login</div></div><p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/image/958/980/338/1661418955938987.png" class="lazy" title="1661418955938987.png" alt="What language is JavaScript?"></p>
<blockquote><p>Note: When using the <script> tag to include external JavaScript files, the default file type is Javascript. Therefore, regardless of whether the loaded file has a .js extension or not, the browser will parse it as a JavaScript script. </script>
What JS can do
JavaScript can be used in various areas of web development, such as:
Web application development: The web pages we browse in daily life are composed of HTML, CSS, and JavaScript. Through JavaScript, the styles of elements in the web page can be updated in real time, and the interaction between people and web pages can be realized ( For example, monitor whether the user clicks the mouse or presses a key, etc.), and you can also add some cool animations to the web page;
Mobile application development: In addition to web applications In addition to development, JavaScript can also be used to develop applications on mobile phones or tablets, and we can also use some excellent frameworks (such as React Native) to make development easier;
Web games: The small games we have played on the web can all be implemented using JavaScript;
Back-end Web application development: In the past, we used JavaScript to develop the front-end part of Web applications, but with the emergence of Node.JS (a JavaScript runtime environment), JavaScript can also be used Used to develop the backend part of web applications.
JavaScript Game Engine
Using HTML5, CSS3 and Javascript can help object-oriented developers develop games with various features, such as: 3D Animation effects, Canvas, math, colors, sounds, WebGL and more. The most obvious advantage is that games developed using HTML5 can run on any modern and popular device.
1. Crafty
craftyJS is a lightweight, modular JavaScript game engine that includes many components: animation, event management, re-zoning, collision detection, sprites, etc. It supports all types of browsers, such as IE9. No dom manipulation and custom drawing programs required.
2. Quintus
Quintus engine is an HTML5 game engine, modular, lightweight, and with concise Javascript-friendly syntax. Quintus is an easy-to-learn, fun-to-use JavaScript HTML5 game engine that supports mobile and desktop development. Contains a modular engine to easily develop games and run multiple instances on the same page.
3. Gamequery
gameQuery is an easy-to-use jQuery plug-in that can help develop Javascript games by adding game-related classes. Since it uses DOM operations Instead of Canvas gameQuery, it is now compatible with a large number of browsers, even older versions: Firefox, Chrome, Internet Explorer, Safari, Safari for iOS, mobile versions of Webkit and Opera.
4. GMP
GMP is an outstanding engine for making sprite-based, 2D games. It can easily design the most retro-style arcade games, and is also a good tool for making games (such as sudoku and gogopop). Online demonstration
5. lycheeJS
lycheeJS is a JavaScript game library that provides complete prototype solutions and HTML5 Canvas deployment in a web browser or native environment WebGL or native OpenGL (ES) based games. The development process of this project optimizes Google Chrome and its own development tools.
6. Enchant.js
Enchant.js is a simple JavaScript framework that can use HTML5 and JavaScript to develop simple games and applications. It is still developed and maintained by UEI's Akihabara Research Center. Online Demo
7. Starlingjs
Starling Starling is an ActionScript 3 2D framework developed based on Stage3D APIs (available for Flash Player 11 and Adobe AIR 3 desktop). Starling is designed for game development, but you can use it for many other applications. Starling makes it possible to write applications with fast GPU acceleration without having to involve low-level Stage3D APIs.
(Learning video sharing: Getting started with web front-end)
The above is the detailed content of What language is JavaScript?. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1379
52
How to implement an online speech recognition system using WebSocket and JavaScript
Dec 17, 2023 pm 02:54 PM
How to use WebSocket and JavaScript to implement an online speech recognition system Introduction: With the continuous development of technology, speech recognition technology has become an important part of the field of artificial intelligence. The online speech recognition system based on WebSocket and JavaScript has the characteristics of low latency, real-time and cross-platform, and has become a widely used solution. This article will introduce how to use WebSocket and JavaScript to implement an online speech recognition system.
WebSocket and JavaScript: key technologies for implementing real-time monitoring systems
Dec 17, 2023 pm 05:30 PM
WebSocket and JavaScript: Key technologies for realizing real-time monitoring systems Introduction: With the rapid development of Internet technology, real-time monitoring systems have been widely used in various fields. One of the key technologies to achieve real-time monitoring is the combination of WebSocket and JavaScript. This article will introduce the application of WebSocket and JavaScript in real-time monitoring systems, give code examples, and explain their implementation principles in detail. 1. WebSocket technology
How to use JavaScript and WebSocket to implement a real-time online ordering system
Dec 17, 2023 pm 12:09 PM
Introduction to how to use JavaScript and WebSocket to implement a real-time online ordering system: With the popularity of the Internet and the advancement of technology, more and more restaurants have begun to provide online ordering services. In order to implement a real-time online ordering system, we can use JavaScript and WebSocket technology. WebSocket is a full-duplex communication protocol based on the TCP protocol, which can realize real-time two-way communication between the client and the server. In the real-time online ordering system, when the user selects dishes and places an order
How to implement an online reservation system using WebSocket and JavaScript
Dec 17, 2023 am 09:39 AM
How to use WebSocket and JavaScript to implement an online reservation system. In today's digital era, more and more businesses and services need to provide online reservation functions. It is crucial to implement an efficient and real-time online reservation system. This article will introduce how to use WebSocket and JavaScript to implement an online reservation system, and provide specific code examples. 1. What is WebSocket? WebSocket is a full-duplex method on a single TCP connection.
JavaScript and WebSocket: Building an efficient real-time weather forecasting system
Dec 17, 2023 pm 05:13 PM
JavaScript and WebSocket: Building an efficient real-time weather forecast system Introduction: Today, the accuracy of weather forecasts is of great significance to daily life and decision-making. As technology develops, we can provide more accurate and reliable weather forecasts by obtaining weather data in real time. In this article, we will learn how to use JavaScript and WebSocket technology to build an efficient real-time weather forecast system. This article will demonstrate the implementation process through specific code examples. We
How to use insertBefore in javascript
Nov 24, 2023 am 11:56 AM
Usage: In JavaScript, the insertBefore() method is used to insert a new node in the DOM tree. This method requires two parameters: the new node to be inserted and the reference node (that is, the node where the new node will be inserted).
Simple JavaScript Tutorial: How to Get HTTP Status Code
Jan 05, 2024 pm 06:08 PM
JavaScript tutorial: How to get HTTP status code, specific code examples are required. Preface: In web development, data interaction with the server is often involved. When communicating with the server, we often need to obtain the returned HTTP status code to determine whether the operation is successful, and perform corresponding processing based on different status codes. This article will teach you how to use JavaScript to obtain HTTP status codes and provide some practical code examples. Using XMLHttpRequest
JavaScript and WebSocket: Building an efficient real-time image processing system
Dec 17, 2023 am 08:41 AM
JavaScript is a programming language widely used in web development, while WebSocket is a network protocol used for real-time communication. Combining the powerful functions of the two, we can create an efficient real-time image processing system. This article will introduce how to implement this system using JavaScript and WebSocket, and provide specific code examples. First, we need to clarify the requirements and goals of the real-time image processing system. Suppose we have a camera device that can collect real-time image data
