what is js

js (full name "JavaScript") is a lightweight, interpreted or just-in-time compiled high-level programming language with function priority. JavaScript has been widely used in web application development, and is often used to add a variety of dynamic functions to web pages to provide users with smoother and more beautiful browsing effects.

Introduction to js

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JavaScript (referred to as "JS ”) is a lightweight, interpreted or just-in-time compiled high-level 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 and declarative (like functional programming) styles.

Features:

JavaScript is a high-level scripting language belonging to the Internet. It has been widely used in Web application development. It is often used to add various dynamic functions to web pages and provide users with Smoother and more beautiful browsing effect. Usually JavaScript scripts realize their functions by embedding them in HTML.

• is an interpreted scripting language (the code is not precompiled).

• is mainly used to add interactive behaviors to HTML (an application under Standard Universal Markup Language) pages.

• It can be directly embedded in HTML pages, but writing it as a separate js file is beneficial to the separation of structure and behavior.

• Cross-platform features, with the support of most browsers, can run on multiple platforms (such as Windows, Linux, Mac, Android, iOS, etc.).

• Javascript scripting language, like other languages, has its own basic data types, expressions and arithmetic operators, and the basic program framework of the program. Javascript provides four basic data types and two special data types for processing data and text. Variables provide a place to store information, and expressions can complete more complex information processing.

• can realize human-computer interaction on web pages.

Usage:

• Embed dynamic text in HTML pages.

• Respond to browser events.

• Read and write HTML elements.

• Validate data before it is submitted to the server.

• Detect the visitor’s browser information.

• Control cookies, including creation and modification.

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

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