What is JavaScript? What functions does it have?

JavaScript is a lightweight, interpreted or just-in-time compiled programming language with function priority. Its functions are: 1. Embedding dynamic text in HTML pages; 2. Responding to browser events ; 3. Read and write HTML elements; 4. Verify the data before it is submitted to the server; 5. Detect the visitor's browser information, etc.

The operating environment of this article: windows7 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 based on prototype programming, a multi-paradigm dynamic scripting language, and supports object-oriented, imperative, declarative, and functional programming paradigm.

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 usually called ECMAScript 6 or ES2015.

What functions does it have?

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

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

[Recommended learning: javascript basic tutorial]

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