此类型的TypeScript泛型

Question

Why is TypeScript (2.1.0) complaining about the following code?

import Request from "../request/request.ts";
export default class Machine{
  private id: number;
  private url:string;
  private make:string;
  private model:string;
  private request:any;
  constructor(){
    var self = this;
    this.request = new Request<self>(this.url); //cannot find name self
  }
}

Answer 1

This line of your code (changed from self to this ):

this.request = new Request<this>(this.url);

Have two different meanings for the this keyword:

1. The actual reference to this at runtime ( this.request and this.url )

2. Specifying of the type of this for compilation ( new Request<this> )

You mixed the two meanings and that's why it does not work, if you want to use the self instead of this then you'll need to do use typeof :

this.request = new Request<typeof self>(this.url);