Web front-end development evolved from the production of web pages, mainly composed of three elements: HTML, CSS, and JavaScript. Professional Web front-end development introductory knowledge will definitely include these content, today I will give you a brief introduction.
HTML
Hypertext Markup Language, an application under the standard universal markup language. It includes a "head" part (English: Head) and a "body" part (English: Body), where the "head" part provides information about the webpage, and the "body" part provides the specific content of the webpage.
CSS Cascading Style Sheet
CSS is a computer language used to express document styles such as HTML (an application of Standard Universal Markup Language) or XML (a subset of Standard Universal Markup Language).
JavaScript
A literal scripting language is a dynamically typed, weakly typed, prototype-based language with built-in support types. It is widely used in the development of Web applications, and is often used to add various dynamic functions to web pages to provide users with smoother and beautiful browsing effects. Usually JavaScript scripts realize their functions by embedding them in HTML.
With the rapid development of the Internet era and changes in corporate needs, the three elements of front-end development technology have also evolved into today's HTML5, CSS3, and jQuery. Therefore, the content of many web front-end development introductory courses has also been adjusted.
HTML5
HTML5 is the fifth major revision of the Hypertext Markup Language. It introduces new functions on the basis of HTML, which can truly change the way users interact with documents. These include: "New parsing rules enhance flexibility and new attributes. , Eliminate obsolete or redundant attributes; drag and drop functions from one HTML5 document to another, offline editing, enhancement of information transfer, detailed parsing rules, multi-purpose Internet mail extensions and protocol handler registration, in the SQL database Common standards (WebSQL) for storing data in the Internet, etc."
CSS3
CSS3 is an upgraded version of CSS (Cascading Style Sheet) technology, which mainly includes modules such as box model, list module, hyperlink mode, language module, background and border, text special effects, and multi-column layout. CSS can not only modify web pages statically, but also dynamically format the elements of web pages with various scripting languages.
jQuery
jQuery, a fast and concise JavaScript framework, encapsulates JavaScript commonly used function codes, provides a simple JavaScript design mode, optimizes HTML document operation, event handling, animation design and Ajax interaction. jQuery is compatible with various mainstream browsers. The core features can be summarized as: unique chain syntax and short and clear multifunctional interface; efficient and flexible css selector, and CSS selector can be extended; convenient plug-in extension Mechanism and rich plug-ins.
It can be easily understood that HTML defines the content of a web page, CSS decorates the layout of a web page, and the behavior of a JavaScript web page. jQuery is a JavaScript library. If you compare a web page to a person, then HTML is the main component of human organs and limbs; CSS is the clothes you wear, which makes you look more beautiful; JavaScript gives people more interaction, such as Communicate with others, make logical judgments, etc.; jQuery is a toolbox for human use.
The above is the basic content of the introduction to Web front-end development that I have compiled. If you want to learn more about front-end development technology and want to accumulate more practical development experience, hurry up and learn!
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