What are the characteristics of JavaScript

The characteristics of JavaScript: 1. Interpreted scripting language, the code does not need to be compiled; 2. Based on objects, using JavaScript can not only create objects, but also operate and use existing objects; 3. Weak types; 4 , Dynamic; 5. Cross-platform.

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

JavaScript ("JS" for short) is currently the most popular and widely used client-side scripting language. It is used to add some dynamic effects and interactive functions to web pages and plays a decisive role in the field of web development.

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 webpage, such as color, font, background, etc.;

• JavaScript is used to update the content of the webpage 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 thereof, etc., to make the web page more vivid.

JavaScript 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 is based on prototype programming, a multi-paradigm dynamic scripting language, and supports object-oriented, imperative, declarative, and functional programming paradigm.

JavaScript has the following characteristics:

1) Interpreted scripting language

JavaScript is an interpreted scripting language, similar to C, C and other languages Different from needing to compile before running, code written in JavaScript 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 can respond to user input without the help of a Web server. For example, when we visit a web page , when you click on a web page with the mouse or scroll the window, you can directly respond to these events through JavaScript.

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 JavaScript.

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