What are the disadvantages of js construction inheritance

This article mainly explains "what are the shortcomings of js construction inheritance". The content of the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn what are the shortcomings of js construction inheritance.

1. An instance is not an instance of a parent class, but an instance of a subclass.

2. Can inherit the instance properties and methods of the parent class, but not the prototype properties / methods.

3. The function cannot be reused, and each subclass has a copy of the parent class instance function, which affects performance.

Example

Function Star (name,age) {this.name=name this.age=age this.sayName=function () {console.log (this.name)}} Star.prototype.sing=function () {alert (this.name)} var ldh=new Star ('Andy Lau', 28) var zxy=new Star ('Jacky Cheung', 29) Thank you for your reading. These are the contents of "what are the shortcomings of js construction inheritance". After the study of this article I believe that you have a deeper understanding of the shortcomings of js construction inheritance, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!