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This article introduces the knowledge of "principle Analysis of prototype object this in 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!

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 "principle Analysis of prototype object this in javascript". Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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