Javascript is not an object-oriented language, but an object-based scripting language. JavaScript can not only create objects, but also use existing objects. And object-oriented includes three major characteristics: encapsulation, inheritance, and polymorphism; while JavaScript only has encapsulation, and inheritance only simulates inheritance, not object-oriented.
The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.
JavaScript ("JS" for short) 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 script language has the following characteristics:
Script language. JavaScript is an interpreted scripting language. Languages such as C and C are compiled first and then executed, while JavaScript is interpreted line by line during the running of the program.
Object based. JavaScript is an object-based scripting language that can not only create objects but also use existing objects.
Simple. The JavaScript language uses weakly typed variable types and does not impose strict requirements on the data types used. It is a scripting language based on Java's basic statements and controls, and its design is simple and compact.
Dynamic. JavaScript is an event-driven scripting language that can respond to user input without going through a Web server. When visiting a web page, JavaScript can directly respond to these events when the mouse is clicked, moved up or down, or moved in the window.
Cross-platform. The JavaScript scripting language does not depend on the operating system and only requires browser support. Therefore, after writing a JavaScript script, it can be brought to any machine for use, provided that the browser on the machine supports the JavaScript scripting language. JavaScript has been supported by most browsers. Unlike server-side scripting languages, such as PHP and ASP, JavaScript is mainly used as a client-side scripting language to run on the user's browser and does not require server support. Therefore, in the early days, programmers preferred JavaScript to reduce the burden on the server, but at the same time it also brought about another problem, security.
Why is JavaScript not an object-oriented language?
Because object-oriented includes three major characteristics: encapsulation, inheritance, and polymorphism. There is only encapsulation in JavaScript, and inheritance is only simulated inheritance, not object-oriented.
All said, in JavaScript, everything is an object, properties, arrays, functions, etc. are all objects.
[Recommended learning: javascript advanced tutorial]
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