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Today, the editor will share with you the relevant knowledge points about the role of jQuery. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article. Let's take a look at it.

What is jQuery?

JQuery literally means JavaScript and Query, libraries used to assist in the development of JavaScript. JQuery is another high quality Javascript library after prototype, which belongs to the open source programming language.

JQuery is a fast, compact, feature-rich JavaScript library.

JQuery makes it easier to traverse and manipulate HTML documents, event handling, and animation.

All the functions of jQuery are accessed through JavaScript, so mastering JavaScript is critical to understanding, building, and debugging code.

The role of jQuery

JQuery itself is a plug-in-based JavaScript library, and its various functions can be enhanced with new plug-ins. JQuery provides an abstract layer for Web programming, making it compatible with any browser, and greatly simplifies the work previously done with JavaScript. All in all, jQuery can do what is shown below.

1. Get document elements quickly: the selection mechanism of jQuery is built on the selector of Css, which provides the ability to quickly query the elements in DOM documents, and greatly strengthens the way to get 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. At present, many well-known websites use jQuery's built-in effects, such as fade in and out, element removal and other dynamic effects.

3, create Ajax no refresh page: Ajax is the abbreviation of asynchronous JavaScript and XML, which can develop very sensitive no refresh web pages, especially when developing server-side web pages, such as PHP websites, need to communicate with the server round trip, if you do not use Ajax, every data update has to refresh the page, but after using the Ajax special effects, the page can be partially refreshed to provide a very dynamic effect.

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 a variety of page events, it can prevent programmers from adding too much event handling code to HTML, and most importantly, its event handler eliminates various browser compatibility issues.

6, change the content of the page: JQuery can modify the content of the page, such as changing the text of the page, insert or transfer the image of the page, jQuery simplifies the way to deal with the original use of JavaScript code.

Characteristics of jQuery

The reason why JQuery is so good is that it integrates a lot of excellent features, including the following:

1. Take advantage of css's selector to provide high-speed element lookup behavior.

two。 An abstraction layer is provided to standardize a variety of common tasks and solve the compatibility problems of various browsers.

3. Simplify the complex code and provide a continuous programming mode, which greatly simplifies the operation of the code.

JQuery has become a very popular JavaScript framework, and has a good extensibility, jQuery can make your work easier.

The difference between jQuery and JavaScript

The JavaScript code for setting UI text without jQuery is as follows:

Document.getElementById ("txt1") .value = "hello"

The JavaScript code after using the jQuery class library is as follows:

$("# txt1") .val ("Hello")

It can be seen that after using the jQuery class library, the JavaScript code is obviously much simpler, but also more in line with the characteristics of the IT industry: short, flat, fast.

These are all the contents of the article "what are the functions of jQuery?" Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more knowledge, please pay attention to the industry information channel.

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