What are the basic features of javascript

The basic features of JavaScript are: 1. Interpreted scripting language, the code written does not need to be compiled and can be run directly; 2. Based on objects, not only can objects be created, but also existing objects can be manipulated and used; 3. Weakly typed, a variable can be initialized to any type; 4. Dynamic, responding directly to user input; 5. Cross-platform, it can run in the browser.

The operating environment of this tutorial: windows10 system, ECMAScript 5 version, DELL G3 computer

JavaScript (referred to as "JS") is currently the most popular , the most widely used client-side scripting language, used to add some dynamic effects and interactive functions to web pages. The development field plays an important role.

JavaScript, HTML and CSS together constitute the web pages we see, among which:

HTML is used to define the content of the web page, such as title, text, images, etc.;

CSS is used to control the appearance of the web page, such as color, font, background, etc.;

JavaScript is used to update the content of the web page in real time, such as obtaining data from the server and updating it to the web page, modifying the style of some tags Or the content, etc., can make the web page more vivid.

JavaScript It is a lightweight, interpreted or just-in-time compiled programming language with function priority. Although it is famous as a scripting language for developing Web pages, it is also used in many non-browser environments. JavaScript A dynamic scripting language based on prototype programming and multi-paradigm, and supports object-oriented, imperative, declarative and functional programming paradigms.

JavaScript has the following characteristics:

1) Interpreted scripting language

JavaScript is an interpreted scripting language, similar to C, C and other languages Need to compile before running, use JavaScript The code you write does not need to be compiled and can be run directly.

2) Object-based

JavaScript is an object-based scripting language. Using JavaScript, you can not only create objects, but also operate and use existing objects.

3) Weak type

JavaScript is a weakly typed programming language that does not have strict requirements on the data type used. For example, you can initialize a variable to any type, or you can initialize it at any time. Change the type of this variable.

4) Dynamic

JavaScript is an event-driven scripting language that does not require the use of the Web The server can respond to user input. For example, when we visit a web page, click on the web page with the mouse or scroll the window, through JavaScript You can respond directly to these events.

5) Cross-platform

JavaScript does not depend on the operating system and can run in the browser. Therefore, after a JavaScript script is written, it can be run on any system, as long as the browser on the system supports it Just JavaScript.

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