what is javascript

Javascript is a lightweight, interpreted or just-in-time compiled programming language with function priority; JavaScript is a dynamic scripting language based on prototype programming, multi-paradigm, and supports object-oriented, imperative and declarative style.

The operating environment of this article: Windows 7 system, JavaScript version 1.8.5, DELL G3 computer.

What is javascript?

JavaScript ("JS" for short) is a lightweight, interpreted or just-in-time compiled programming language with function priority. Although it is famous as a scripting language for developing Web pages, it is also used in many non-browser environments. JavaScript is a dynamic scripting language based on prototype programming, multi-paradigm, and supports object-oriented, imperative and declarative (such as functional programming) style.

JavaScript was first designed and implemented in 1995 by Brendan Eich of Netscape Company on the Netscape Navigator browser. Because Netscape was working with Sun, Netscape management wanted it to look like Java, hence the name JavaScript. But in fact its grammatical style is closer to Self and Scheme.

The standard for JavaScript is ECMAScript. As of 2012, all browsers fully support ECMAScript 5.1, and older browsers support at least the ECMAScript 3 standard. On June 17, 2015, ECMA International released the sixth edition of ECMAScript, which is officially called ECMAScript 2015, but is often called ECMAScript 6 or ES2015.

Main functions

1. Embed dynamic text in HTML pages.

2. Respond to browser events.

3. Read and write HTML elements.

4. Validate data before it is submitted to the server.

5. Detect the visitor’s browser information. Control cookies, including creation and modification.

6. Server-side programming based on Node.js technology.

Language composition

ECMAScript describes the syntax and basic objects of the language.

Document Object Model (DOM) describes the methods and interfaces for processing web content.

Browser Object Model (BOM) describes the methods and interfaces for interacting with the browser.

[Recommended learning: js basic tutorial]

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