What do js and jquery mean?

The meaning of js and jquery: 1. js is the abbreviation of JavaScript. It is a scripting language often used in web clients, mainly used to add dynamic functions to HTML; 2. jquery is a cross-browser A JavaScript library for the browser that simplifies operations between HTML and JavaScript.

The operating environment of this tutorial: windows10 system, jquery3.2.1 version, Dell G3 computer.

What do js and jquery mean

1. js

Javascript (JS) is A scripting language primarily used on the Web. It is used to enhance HTML pages and can often be embedded in HTML code. JavaScript is an interpreted language. Therefore, it does not require compilation. JavaScript renders web pages interactively and dynamically. This allows the page to react to events, display special effects, accept variable text, validate data, create cookies, detect the user's browser, etc.

Generally, HTML pages are mainly used to display static content, but in practice, pages are rarely static. Nowadays, websites will have some forms and slides, which are all created using js. For interaction, there are actually some languages ​​​​that can be used to write scripts. In fact, they are all js.

js is mainly used for web development. It can add various dynamic effects to the website to make the web page more beautiful.

Characteristics of Javascript

• 1.js is object-oriented, we can create objects and use existing objects.

• 2.js is a scripting language that can be executed without compilation, and is directly interpreted during operation.

• 3.js does not require any operating system, as long as it is supported by a browser, and it supports multiple browsers at the same time.

• 4.js does not require any requirements for data types, and the method adopted is weak type.

2. jquery

jQuery is a fast, small and feature-rich JavaScript library. Things like traversing and manipulating HTML documents, event handling, animations, and Ajax are made easier with an easy-to-use API that works across multiple browsers.

jQuery is a tool library for JavaScript. The tool library refers to encapsulated JavaScript functions that can be called directly in the program. Then jQuery is a very popular JavaScript library. jQuery is designed to "write less code and do more." The jQuery library encapsulates common JavaScript function codes, provides a simple JavaScript design pattern, and optimizes HTML document operations, event processing, animation design, and Ajax interaction.

jQuery Advantages

Low space occupied:

The reduced and compressed jQuery file is only 30KB.

Comply with CSS3 specifications:

Supports CSS3 selector to find elements and style attribute operations.

Cross-browser:

jQuery is compatible with various mainstream browsers, such as IE, Chrome, Firefox, Safari, Opera, etc.

jQuery Features

Quickly obtain document elements

jQuery’s selection mechanism is built on the Css selector, which provides the ability to quickly query elements in DOM documents, and is greatly enhanced How to get page elements in JavaScript.

Provide beautiful page dynamic effects

jQuery has a series of built-in animation effects, which can develop very beautiful web pages. Many websites use jQuery’s built-in effects, such as fade in and fade out, Dynamic special effects such as element removal.

Create AJAX non-refresh web pages

AJAX is the abbreviation of asynchronous JavaScript and XML, which can develop very sensitive non-refresh web pages, especially when developing server-side web pages, such as PHP websites, it is necessary Communicate back and forth with the server. If AJAX is not used, the web page has to be refreshed every time the data is updated. However, after using AJAX special effects, the page can be partially refreshed to provide dynamic effects.

Provides enhancements to the JavaScript language

jQuery provides enhancements to basic JavaScript structures, such as element iteration and array processing.

Enhanced event handling

jQuery provides various page events, which can avoid programmers from adding too much event handling code in HTML. Most importantly, its event handler eliminates Fixed various browser compatibility issues.

Change the content of the web page

jQuery can modify the content of the web page, such as changing the text of the web page, inserting or flipping the web page image. jQuery simplifies the way that JavaScript code needs to be processed.

Recommended related video tutorials: jQuery video tutorial

The above is the detailed content of What do js and jquery mean?. For more information, please follow other related articles on the PHP Chinese website!