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This article mainly introduces the relevant knowledge of the principle instance analysis of the prototype object this in javascript, the content is detailed and easy to understand, the operation is simple and fast, and it has a certain reference value. I believe you will gain something after reading this article on the principle instance analysis of the prototype object this in javascript. Let's take a look.

Principle

1. Only when this function is called can you determine who the this in the constructor points to.

2. Generally speaking, the this in the constructor refers to the caller of the function.

Example

Function Star (uname, age) {this.uname = uname; this.age = age;} var that; Star.prototype.sing = function () {console.log ('I can sing'); that = this;} var ldh = new Star ('Andy Lau', 18); / / 1. In the constructor, this points to the object instance ldh ldh.sing (); console.log (that = ldh); / / 2. The this in the prototype object function points to the instance object ldh. This is the end of the article on "principle instance Analysis of prototype object this in javascript". Thank you for reading! I believe you all have a certain understanding of the knowledge of "principle instance Analysis of prototype object this in javascript". If you want to learn more, you are welcome to follow the industry information channel.

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