js to javascript

With the continuous development of Web technology, JavaScript has become one of the most commonly used programming languages ​​in the Internet field. JavaScript occupies an important position in fields such as web application development, mobile development, and big data visualization. As a dialect of JavaScript, JS is also widely used in many places. This article will explore the relationship between JS and JavaScript, the characteristics of JS, and the method of converting JS into JavaScript.

1. The relationship between JS and JavaScript

JS, JavaScript, is a native, object-oriented scripting language with functional programming capabilities. It was originally developed by Netscape. With the establishment of the ECMA International Organization, JavaScript was standardized as ECMAScript. At the same time, JavaScript also has the browser-side object model (DOM) and event model (BOM), making it one of the core technologies for Web front-end development.

JS, as a dialect of JavaScript, is expanded on the basis of JavaScript. JS has some functions and APIs that JavaScript does not have, such as threads, file reading and writing, network communication, etc. At the same time, the syntax of JS is also slightly different from JavaScript. For example, JS supports macro definition, macro expansion, etc. Therefore, if you want to convert JS to JavaScript, you need to understand the characteristics of JS and the syntax differences.

2. Characteristics of JS

1. Multi-threading

JS supports multi-thread programming through the built-in Thread object, which can handle multiple tasks at the same time and can be easily implemented Communication and synchronization between threads.

2. File reading and writing

JS has a file reading and writing system that can easily read and write local files and network files. It also supports common file formats, such as JSON, XML, CSV, etc.

3. Network communication

JS supports network communication. It can use TCP or UDP protocol for Socket communication. It also supports native processing of HTTP and HTTPS protocols, making it easy for JS to capture Web data. Fetching and network programming.

4. Macro definition and macro expansion

JS supports macro definition and macro expansion, making code reuse more convenient and faster.

3. Method of converting JS to JavaScript

Since the syntax of JS and JavaScript is quite different, converting JS to JavaScript requires the use of tools. There are two commonly used tools at present: manual conversion and automatic conversion.

Manual conversion requires developers to be very familiar with both JS syntax and JavaScript syntax. They need to compare the differences between the two syntaxes line by line and make corresponding modifications. This conversion method is suitable for smaller code sizes and requires developers to have higher JavaScript proficiency.

Automatic conversion uses tools to automatically convert JS code and convert JS code into JavaScript code. Currently, the more commonly used tool is Babel. Babel is a popular JavaScript compiler that converts JS code into JavaScript code that browsers can understand. Babel is not just a simple syntax replacement of JS code, but it implements the compilation of various new features such as ES6 and ES7. It also supports a series of plug-ins and presets to facilitate developers to customize the compilation. In addition, Babel has another important application scenario, which is to convert JSX into JavaScript in front-end development tools. JSX is a syntax extension of the React framework, used to describe the virtual DOM structure of mixed HTML and JavaScript. Babel also supports converting JSX into JavaScript.

In short, although JS and JavaScript have differences in syntax and functionality, they are both crucial programming languages ​​in web development. Converting JS to JavaScript can expand the application scenarios of JS and facilitate porting to various environments. Manual conversion or automatic conversion can better realize the conversion of JS to JavaScript, improve development efficiency and improve code quality.

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