Have a preliminary understanding of JavaScript, Ajax, and jQuery, and compare the relationship between the three

This article mainly introduces the preliminary understanding of JavaScript, Ajax, jQuery, and compares the relevant information on the relationship between the three. Friends in need can refer to it

jquery is a good encapsulation of javascript and is very light. magnitude, it can be roughly called a framework. Let's compare the implementation of ajax by javascript and jquery to highlight the simplicity of implementation after jquery encapsulates it. And not only that, use jquery instead of javascript to implement it. Some features will also bring unexpected benefits to browser compatibility.

1. Basic understanding

1. JavaScript

Definition:

The abbreviation of javaScript is JS, which is a scripting language developed by Netscape. It is a scripting language widely used in client-side Web development. It is often used to add dynamic functions to HTML web pages (the programs written by it can be embedded in HTML or XML page, and interpreted and executed directly in the browser).

Components:

Core (ECMAScript), Document Object Model (DOM for short), Browser Object Model (BOM for short)

Description:

Javascript is a new programming language born to meet the needs of dynamic web page production. It is now more and more widely used in Internet web page production.

Javascript is a scripting language developed by Netscape, or a description language. Based on HTML, interactive Web pages can be developed using Javascript.

The emergence of Javascript enables a real-time, dynamic, and interactive relationship between web pages and users, making web pages contain more active elements and more exciting content.

Javascript is short and concise, and is executed on the client machine, which greatly improves the browsing speed and interactive capabilities of the web page. At the same time, it is a simple programming language specifically tailored for making Web pages.

The mainstream javaScript frameworks include: YUI, Dojo, Prototype, jQuery...

2, Ajax

Definition ：

AJAX stands for "Asynchronous JavaScript and XML" (Asynchronous JavaScript and XML). AJAX is not an abbreviation, but a noun created by Jesse James Gaiiett. It refers to a web development technology for creating interactive web applications. .

AJAX is not a technology, it is actually several technologies. Each technology has its own unique features. Together they become a powerful new technology.

Composition:

Representation based on XHTML and CSS standards;

Use Document Object Model for dynamic display and interaction;

Use XML and XSLT for data Interaction and manipulation;

Use XML HttpRequest for asynchronous communication with the server;

Use JavaScript to bind everything.

Description:

Ajax is a combination of Java technology, XML, JavaScript and other programming technologies, which allows developers to build Web applications based on Java technology and breaks the management of page reloading.

Ajax technology uses asynchronous HTTP requests to transfer data between the Browser and the Web Server, so that the Browser only updates part of the web page content without reloading the entire web page.

Ajax is a Web application development method that uses client-side scripts to exchange data with the Web server. In this way, the Web page can be dynamically updated without interrupting the interaction process and re-editing it. Using Ajax, users can create direct, highly available, richer, and more dynamic Web user interfaces that are close to native desktop applications.

3.jQuery

Definition:

jQuery is a fast, concise javaScript library that enables users to more easily Easily process HTML documents and events, implement animation effects, and easily provide AJAX interaction for websites.

Features:

Since A framework for client code, independent of ASP.NET or JAVA;

jquery is currently a very popular JavaScript framework. Using a selector similar to CSS, it can easily operate HTML elements. It has good scalability and has many plug -ins.

Description:

For programmers, simplifying javascript and ajax programming can free programmers from designing and writing complex JS applications, and turn their attention to functional requirements rather than implementation details, thereby improving the development speed of the project.

For users, it improves the visual effect of the page, enhances the interactivity with the page, and experiences more gorgeous web page materials.

The javaScript framework is actually a series of tools and functions.

2. The relationship between the three

I will use a map to illustrate the relationship between the three:

Explanation:

javaScript is a scripting language used for Web client development. Ajax is a new technology based on JS language, which mainly combines JS, CSS, and XML technologies. It is used to create interactive web applications. Web development technology. jQuery is a JS framework. It is a JS library developed based on the JS language and Ajax technology. It encapsulates the functions of JS and Ajax and provides functional interfaces, which greatly simplifies the operations of Ajax and JS.

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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