What is jquery?

jquery is a package of JavaScript functions. jQuery encapsulates commonly used functional codes (functions) in JavaScript, provides a simple JavaScript design pattern, and optimizes HTML document operations, event processing, animation design and Ajax interaction.

The operating environment of this tutorial: windows7 system, jquery1.10.2 version, Dell G3 computer.

jQuery is a fast and concise JavaScript framework. It is another excellent JavaScript code library (framework) after Prototype. It was released by John Resig in January 2006.

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

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 purpose of jQuery design is "write Less, Do More", which means writing less code and doing more things.

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; it has convenient plug-in extensions 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.

jQuery 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 develop very beautiful web pages. Many websites use jQuery’s built-in effects, such as fade-in Dynamic special effects such as fade out and element removal.

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 handling

jQuery provides various page events, which can prevent programmers from adding too much event handling code in HTML. Most importantly, its event handling The browser eliminates 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 way that JavaScript code needs to be processed.

[Recommended learning: jQuery video tutorial, web front-end video]

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