What is jQuery used for? jQuery is actually a js framework

Introduction to jQuery

The jQuery library can be added to a web page with a simple line of markup.

Basic knowledge you need Before you start learning jQuery, you should have a basic understanding of the following:

• HTML
• CSS
• JavaScript

If you need to study these subjects first, please find these tutorials on our home page.

What is jQuery?

jQuery is a JavaScript library.

jQuery is a lightweight "write less, do more" JavaScript library.

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advantage:

Compared with native js code, very powerful functions can be achieved with very little code, and the compatibility is also good. Now many people use native js to consider supporting multiple browsers, etc., especially jQuery's selector is relatively powerful. It is generally used in actual projects to reduce the development cycle. Most companies will require the use of jQuery, and ordinary people's js cannot reach this level.

shortcoming:

But for students who are just starting to learn js, using this is not conducive to learning. Many people may use jquery but are not very good at writing native js, which is not conducive to the improvement of personal skills. Therefore, for early js learners, you can first practice with native js and learn by comparing it with jquery. Otherwise, there will be no better js library than jquery in the future.

The jQuery library includes the following features:

• HTML element selection
• HTML element manipulation
• CSS Operations
• HTML Event Functions
• JavaScript Effects and Animations
• HTML DOM traversal and modification
• AJAX
• Utilities

Tip: In addition, Jquery also provides a large number of plug-ins.

Why use jQuery?

There are a large number of open source JS frameworks on the Internet, but jQuery is the most popular JS framework and provides a large number of extensions.

Many big companies are using jQuery, for example:

Google
Microsoft
IBM
Netflix

Does jQuery work on all browsers?

The jQuery community is aware of the numerous compatibility issues with JS in different browsers. Currently, jQuery is compatible with all major browsers, including Internet Explorer 6!

jQuery is a framework based on JavaScript class library. It provides many JavaScript class libraries and some CSS style sheet encapsulation. It is easy to use, simplifies the interaction between users and browsers, and improves system performance and development efficiency.

The design principle of jQuery is "write Less, Do More", which advocates writing less code and doing more things. It encapsulates commonly used JavaScript functional codes and provides a simple JavaScript design mode to optimize HTML document operations, event processing, animation design and Ajax interaction.

The core features of jQuery can be summarized as: unique chain syntax and short, clear and multi-functional interface; efficient and flexible CSS selectors, and the ability to extend CSS selectors; convenient plug-in extension mechanism and rich plug-ins. jQuery is compatible with various mainstream browsers, such as IE 6.0+, FF 1.5+, Safari 2.0+, Opera 9.0+, etc.

Language Features

1. 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 greatly enhances the way to obtain page elements in JavaScript.

2. Provide beautiful page dynamic effects

jQuery has a series of built-in animation effects, which can be used to develop very beautiful web pages. Many websites use jQuery's built-in effects, such as fade in and out, element removal, and other dynamic effects.

3. Create AJAX non-refresh web page

AJAX is the abbreviation of asynchronous JavaScript and ML, which can be used to develop very responsive and refresh-free web pages. This is especially true when developing server-side web pages, such as PHP websites, which require round-trip communication with the server. If AJAX is not used, the web page will have to be refreshed every time the data is updated. After using AJAX effects, the page can be partially refreshed to provide a dynamic effect.

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