What is the role of jquery?

The functions of jquery: 1. Quickly obtain elements of DOM documents; 2. Built-in a series of animation effects, providing beautiful page dynamic effects, and can develop very beautiful web pages; 3. Create Ajax without refresh Web page; 4. Provides various page events, enhances event processing capabilities, and its event processor eliminates various browser compatibility issues.

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jQuery is a set of JavaScript Library that simplifies some of the complexities of developing web effects using Javascript, providing automation of common tasks and simplification of complex tasks.

Once launched, it has been greatly welcomed by website builders. It has basically become the mainstream JavaScript language library. Many website development employers will require jQuery to be mastered when recruiting. Using jQuery can not only save a lot of JavaScript code that originally required The functions that can be realized are reduced to a few lines of code, and it provides sufficiently high-speed performance, which is a skill that every website developer should master.

JQuery is actually an extension of existing JavaScript. It is very lightweight, about 32KB after compression. It is compatible with various browsers, so you can easily add multiple Browser effects. jQuery was originally created by American John Resig. After several versions of development, the latest version is jQuery3.4.1. The most important thing is that it provides quite complete documentation, making it easier for jQuery enthusiasts to learn.

The role of jQuery

jQuery itself is a plugin-based JavaScript library, and its various functions can be enhanced through new plugins. jQuery provides an abstraction layer for Web programming, making it compatible with any browser, and greatly simplifying the work originally done with JavaScript. In short, jQuery can complete the work shown below.

1. Quickly obtain document elements: jQuery's selection mechanism is built on the CSS selector. 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. Currently, many well-known websites use jQuery’s built-in effects, such as fade in and fade out. , dynamic special effects such as 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, which need to go back and forth with For server communication, 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, providing a very dynamic effect.

4. Provide enhancements to the JavaScript language: JQuery provides enhancements to the basic JavaScript structure, such as element selection 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 handler 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 converting web page images. jQuery simplifies the way that JavaScript code needs to be processed.

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