What does jquery library mean?

The jquery library refers to an encapsulated JavaScript function library, a lightweight "write less, do more" JavaScript library. jquery encapsulates commonly used function codes in JavaScript, providing a simple JavaScript design patterns to optimize HTML document operations.

The operating environment of this tutorial: windows7 system, jquery3.2.1 version, thinkpad t480 computer.

Related free learning recommendations: javascript (video), jQuery Tutorial(Video)

jquery library refers to an encapsulated JavaScript function library, a lightweight " Write less, do more" JavaScript library.

• The purpose of jQuery design is "write less, do more", which means writing less code and doing more things.

• jquery encapsulates common JavaScript function codes, provides a simple JavaScript design pattern, and optimizes HTML document operations, event processing, animation design, and Ajax interaction.

• The core features of jQuery can be summarized as follows: It has a unique chain syntax and a short and clear multi-functional interface; it has an efficient and flexible CSS selector, and can extend the CSS selector ; Has a 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 selection mechanism construction Based on CSS selectors, it 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 develop very beautiful web pages. Many websites use jQuery Built-in effects, such as fade in and fade out, element removal and other dynamic special effects.

3. Create AJAX non-refresh web pages

AJAX is the abbreviation of asynchronous JavaScript and XML. It can develop very sensitive non-refresh web pages, especially when developing server-side Web pages, such as PHP websites, need to communicate with the server back and forth. 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.

4. Provide enhancements to the JavaScript language

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

5. Enhanced event processing

jQuery provides various page events, which can prevent programmers from adding too much event processing code in HTML. The most important thing is Yes, its event handlers eliminate various browser compatibility issues.

6. 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 original use of JavaScript code The way it needs to be handled.

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