Analysis of object prototype proto instance in Javascript

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Description

1. All objects have an attribute _ _ proto__ that points to the prototype prototype object of the constructor. The reason why we can use the properties and methods of the constructor prototype prototype object is that the object has a _ _ proto__ prototype.

2. The meaning of the _ _ proto__ object prototype is to provide a direction or a route for the object search mechanism, but it is a non-standard attribute, so this attribute can not be used in actual development, it only refers to the prototype object prototype.

Example

Function Star (uname, age) {this.uname = uname; this.age = age;} Star.prototype.sing = function () {console.log ('I can sing');} var ldh = new Star ('Andy Lau', 18); var zxy = new Star ('Jacky Cheung', 19); ldh.sing () Console.log (ldh); / / the system itself adds a _ _ proto__ to the prototype object prototype console.log of our constructor (ldh.__proto__ = = Star.prototype) / / search rules for methods: first look at whether there is a sing method on the ldh object, and if so, execute the sing / / if there is no sing method on this object, because of the existence of _ _ proto__, go to the construction function prototype object prototype to find the sing method so far. I believe you have a deeper understanding of "object prototype proto instance analysis in Javascript". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!