Angular2调用其他类的方法存在于同一个Typescript中

Question

我想从 Class2 的其他方法调用 Class1 的方法 - sometMethod()

这怎么可能？

两个类都存在于同一个 Typescript 中。

export class Class1 {

    constructor(public nav: NavController, public formBuilder: FormBuilder, public viewCtrl: ViewController) {
        this.nav = nav;
    }

    sometMethod() {
      console.log("someMethod of Class1");
    }
}


export class Class2 {

    constructor(public nav: NavController, public formBuilder: FormBuilder, public viewCtrl: ViewController) {
        this.nav = nav;
    }

    sometOtherMethod() {
      console.log("someOtherMethod of Class2");
      //I want to call a method of Class1 - sometMethod()
      //How is that possible?
      //Class1.someMethod(); //Does not Worked!!
    }
}

Answer 1

要么在class2中创建class1的实例，然后从实例中调用class1的方法，要么将方法设为static，然后按你写的那样使用。

选项 1:

export class Class1 {
    constructor(public nav: NavController, public formBuilder: FormBuilder, public viewCtrl: ViewController) {
        this.nav = nav;
    }

    sometMethod() {
      console.log("someMethod of Class1");
    }
}

export class Class2 {
    constructor(public nav: NavController, public formBuilder: FormBuilder, public viewCtrl: ViewController) {
        this.nav = nav;
    }

    sometOtherMethod() {
      console.log("someOtherMethod of Class2");
      let class1Instance = new Class1(this.nav, this.formBuilder, this.viewCtrl);
      class1Instance.someMethod();
    }
}

选项 2:

export class Class1 {
    constructor(public nav: NavController, public formBuilder: FormBuilder, public viewCtrl: ViewController) {
        this.nav = nav;
    }

    static sometMethod() {
      console.log("someMethod of Class1");
    }
}

export class Class2 {
    constructor(public nav: NavController, public formBuilder: FormBuilder, public viewCtrl: ViewController) {
        this.nav = nav;
    }

    sometOtherMethod() {
      console.log("someOtherMethod of Class2");
      Class1.someMethod();
    }
}