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This article introduces the relevant knowledge of "how to realize the inheritance relationship of Javascript". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Description

1. Inheritance relationships in JavaScript are implemented through a pattern called "prototype chain".

2. When discussing inheritance, Javascript has only one structure: an object. Each instance object (object) has a private property (_ _ proto__) that points to the prototype object (prototype) of its constructor. This prototype object also has its own prototype object (_ _ proto__) until the prototype object of the object is empty. Null by definition, null does not have a prototype and is the last connection to that prototype chain.

Example

Objectname. [[prototype]] objectname.prototypeobjectname ["_ proto__"] what is the language javascript is a dynamically typed, weakly typed language, based on object and event-driven, relatively secure and widely used in client-side web page development, as well as a widely used client-side Web development scripting language. It is mainly used to add dynamic functions to HTML web pages, and now JavaScript can also be used in web servers, such as Node.js.

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