What is html? What is JavaScript?

HTML is a text-based markup language used to describe web documents; it tells the browser how to display images, fonts and other multimedia elements on the Internet. JavaScript is a cross-platform interpreted, dynamically typed, weakly typed, prototype-based, network-based scripting language that is commonly used to add a variety of dynamic functions to web pages.

The operating environment of this tutorial: windows7 system, HTML5&&javascript version 1.8.5, Dell G3 computer.

What is HTML?

HTML, Hyper Text Markup Language, is an application under the standard universal markup language. HTML is not a programming language, but a markup language used to describe web documents, which is necessary for web page production. It includes a series of tags through which document formats on the network can be unified and scattered Internet resources can be connected into a logical whole.

HTML displays text, audio and video, pictures, tables, buttons, input boxes and other content through tags (marked instructions).

Let's look at the meaning of hypertext tag language and web pages.

• Hypertext: Hypertext simply means "text within text." There is a link in the text, which is a hypertext. Whenever you click a link to a new web page, you click on hypertext. Hypertext is a method of linking two or more web pages (HTML documents) to each other.

• Tag Language: A tag language is a computer language used to apply layout and formatting conventions to text documents. Tag languages ​​make text more interactive and dynamic. It can convert text into images, tables, links, etc.

• Web page: A web page is a document usually written in HTML and translated by a web browser. Web pages can be identified by entering the URL. Web pages can be of static or dynamic type. Only with the help of HTML we can create static web pages.

Therefore, HTML is a text-based markup language that tells the browser how to display images, fonts, and other multimedia elements on the Internet. It is used to create attractive web pages with the help of styles and viewed in beautiful format on web browsers. HTML documents are composed of many HTML tags, each HTML tag contains different content.

What is JavaScript?

JavaScript is a dynamically typed, weakly typed, prototype-based language. Its interpreter is called the JavaScript engine, which is part of the browser and is widely used in client-side scripting languages. It was first used on HTML web pages to add dynamic functions to HTML web pages.

JavaScript is a network scripting language that has been widely used in Web application development. It is often used to add various dynamic functions to web pages and provide users with smoother and more beautiful browsing effects. Usually JavaScript scripts realize their functions by embedding them in HTML.

JavaScript is a cross-platform interpreted language that does not require pre-compilation and can run under various operating systems.

JavaScript can be used in various fields of Web development, such as:

• Web application development: The web pages we browse in daily life are composed of HTML, CSS, JavaScript It is composed of JavaScript, which can update the style of elements in the web page in real time, and can realize the interaction between people and the web page (such as monitoring whether the user clicks the mouse or presses a certain button, etc.), and can also add some dazzling features to the web page. Cool animation;

• Mobile application development: In addition to web application development, JavaScript can also be used to develop applications on mobile phones or tablets, and we can also use some excellent Frameworks (such as React Native) make development easier;

• Web games: Those small games we have played on the web can all be implemented using JavaScript;

• Back-end Web application development: In the past, we used JavaScript to develop the front-end part of Web applications, but with the emergence of Node.JS (a JavaScript runtime environment), JavaScript can also be used to develop the back-end part of the web application.

For more programming-related knowledge, please visit: Introduction to Programming! !

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