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This article mainly explains "what is the role of javascript", interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's make up a small series to take you to learn "what is the role of javascript"!

JavaScript functions: 1. embed dynamic text and 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 visitor browser information;6. control cookies, including creation and modification.

Operating environment of this article: Windows 7 system, Javascript version 1.8.5, Dell G3 computer.

What does javascript do?

JavaScript can achieve the effect of page switching, animation effects, page games and other effects. JavaScript, however, takes on more responsibility. Especially with the rise of Ajax technology, the user experience of websites has been greatly improved. For example, when people enter a few words in Baidu's search box, the web page will intelligently perceive the content that the user wants to search next, and a drop-down menu will appear. The realization of this effect cannot be separated from JavaScript. In addition, JavaScript's use is not limited to browsers, the emergence of Node.js allows developers to write JavaScript code on the server side, making JavaScript more widely used.

To sum up, everyday JavaScript uses can be summarized into the following main areas:

1. Embed dynamic text in HTML pages.

2. Respond to browser events.

3. Read and write HTML elements.

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

5. Detect visitor browser information.

6. Control cookies, including creation and modification.

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

Introduction to JavaScript:

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

JavaScript was first designed and implemented in Netscape Navigator in 1995 by Brendan Eich of Netscape. Because Netscape worked with Sun, Netscape management wanted it to look like Java, hence the name JavaScript. In fact, it is similar to Self and Scheme. [2]

JavaScript is ECMAScript. As of 2012, all browsers fully support ECMAScript 5.1, with older versions supporting at least ECMAScript 3. On June 17, 2015, ECMA International released the sixth edition of ECMAScript, officially known as ECMAScript 2015, but commonly referred to as ECMAScript 6 or ES2015.

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