构造函数和 ngOnInIt 有什么区别？

Question

It seems to be similar functions, what are the main differences and purposes of them

//Code

import { OnInit } from '@angular/core';
constructor(){


}

ngOnInit(){

}

Answer 1

People have already mentioned life cycle hooks so I won't talk about that. However, Angular docs state that in the constructor you should only do lightweight operations such as simple sync variable assignments.

In ngOnInit you should do more heavy lifting operations such as HTTP requests, etc