javascript - 实例泛型类抛出 "is not a constructor"

Question

我试图实例化一个作为参数传递给另一个类的类，我将其放在一个文件中，ImportedClass.ts:

export default class ImportedClass {
  public constructor() {
  }
  public async exampleMethod() {
    return "hey";
  }
}

这在另一个 InstanceClass.ts 中:

interface GenericInterface<T> {
  new(): T;
}

export default class InstanceClass <T extends { exampleMethod() }> {
  private c: GenericInterface<T>;
  public constructor(c: GenericInterface<T>) {
  }
  async work() {
    const instanceTry = new this.c();
    instanceTry.exampleMethod();
  }
}

这在另一个 ClassCaller.ts 中:

import ImportedClass from './ImportedClass';
import ImportedClass from './InstanceClass';

const simulator = new InstanceClass (ImportedClass);

然后当我这样调用它时:

simulator.work();

它抛出这个错误:

this.c is not a constructor

Answer 1

您忘记实际使用构造函数参数!

private c: GenericInterface<T>;
public constructor(c: GenericInterface<T>) {
}

你错过了这个:

private c: GenericInterface<T>;
public constructor(c: GenericInterface<T>) {
   this.c = c;
}

你可以这样做......自动 map !

public constructor(private c: GenericInterface<T>) {
}