What is the function of object prototype proto in Javascript
This article mainly introduces the relevant knowledge of the role of the object prototype proto in Javascript, the content is detailed and easy to understand, the operation is simple and fast, and has a certain reference value. I believe you will gain something after reading this article on the role of object prototype proto in Javascript. Let's take a look at it.
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, check whether there is a sing method on the ldh object. 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. This is the end of the article on "what is the function of the object prototype proto in Javascript"? Thank you for reading! I believe you all have a certain understanding of the knowledge of "what is the role of the object prototype proto in Javascript". If you want to learn more, you are welcome to follow the industry information channel.
