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This article introduces the relevant knowledge of "the introduction of the relationship among JavaScript, Ajax and jQuery". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Jquery is a good package for javascript, and it is very lightweight, which can be approximately called a framework. Let's compare the implementation of ajax between javascript and jquery in order to highlight the convenience of implementation after jquery encapsulates it. Moreover, using jquery instead of javascript to achieve some functions will also bring unexpected benefits to the compatibility of browsers.

1. Basic understanding

1 、 JavaScript

Definition:

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

Components:

Core (ECMAScript), document object model (Document Object Model, DOM), browser object model (Browser Object Model, BOM)

Description:

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

Javascript is a scripting language (scripting language), or description language, developed by Netscape. On the basis of HTML, interactive Web web pages can be developed using Javascript.

The emergence of Javascript makes the web page and users to achieve a real-time, dynamic, interactive relationship, so that the web page contains more active elements and more wonderful content.

Javascript is short and executed on the client, which greatly improves the browsing speed and interactive ability of the web page. At the same time, it is a simple programming language tailor-made for making Web web pages.

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

2 、 Ajax

Definition:

AJAX means "Asynchronous JavaScript and XML" (asynchronous JavaScript and XML). AJAX is not an acronym, but a noun coined by Jesse James Gaiiett, which refers to a web page development technology for creating interactive web applications.

AJAX is not a technology, it is actually several technologies, each technology has its own unique characteristics, together to 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 exchange and operation

Use XML HttpRequest to communicate with the server asynchronously

Use JavaScript to bind everything.

Description:

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

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

Ajax is a Web application development method that uses client script to exchange data with Web servers. In this way, the Web page can be updated dynamically without interrupting the interaction process for re-tailoring. With Ajax, users can create a direct, highly available, richer, and more dynamic Web user interface close to local desktop applications.

3 、 jQuery

Definition:

JQuery is a fast and concise javaScript library, which makes it easier for users to deal with HTML documents, events, animation, and provide AJAX interaction for the website.

Features:

Lightweight, chained syntax, CSS1-3 selector, cross-browser, simple, easy to extend

JQuery is a framework independent of server-side code, independent of ASP.NET or JAVA

JQuery is currently a very popular JavaScript framework, using a selector similar to CSS, you can easily manipulate HTML elements, has a good extensibility, and has many plug-ins.

Description:

For programmers, simplifying javascript and ajax programming can free programmers from the complicated design and writing of JS applications, and shift their attention to functional requirements rather than implementation details, thus improving the speed of project development.

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

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

Second, the relationship between the three.

JavaScript is a scripting language for Web client development. Ajax is a new technology based on JS language, which mainly combines JS, CSS and XML. It is a web page development technology used to create interactive web applications. JQuery is the framework of JS, which is based on JS language and integrates Ajax technology to develop JS library, which encapsulates the functions of JS and Ajax, provides functional interfaces, and greatly simplifies the operation of Ajax,JS.

This is the end of the introduction of the relationship among JavaScript, Ajax and jQuery. Thank you for your reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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