来自另一个类的javascript访问数组

Question

我想从另一个班级访问一个数组 的 FirstClass.ts

items:any = [];

export class ContainsDataArray {

  saveItems(item){
    this.items.push(item); 
 }
}

二等

export class AccessArrayfromAnotherClass {
(Call the array from the FirstClass this.items to be exact)

}

Answer 1

这个怎么样：

class A {
    static array: number[] = [1, 2, 3];
    constructor() {}
}

class B {
    constructor() {}
    
    getArray() {
    	console.log(A.array);
    }
}

f = new B();
f.getArray();

Answer 2

在面向对象编程（OOP）中，您可以使用合成或继承。

组合物

＆＃13;

＆＃13;

class ContainsDataArray {
  constructor() {
    this._items = [];
  }
  
  saveItem(item) {
    this._items.push(item); 
  }
  
  get items() {
    return this._items;
  }
}

class AccessArrayfromAnotherClass {
  constructor() {
    this._ref = new ContainsDataArray();
  }
  
  get ref() {
    return this._ref;
  }
}

let instance = new AccessArrayfromAnotherClass();

instance.ref.saveItem('Foo');
instance.ref.saveItem('Bar');

console.log(instance.ref.items);

＆＃13;

＆＃13;

＆＃13;

继承

＆＃13;

＆＃13;

class ContainsDataArray {
  constructor() {
    this._items = [];
  }
  
  saveItem(item) {
    this._items.push(item); 
  }
  
  get items() {
    return this._items;
  }
}

class AccessArrayfromAnotherClass extends ContainsDataArray {}

let instance = new AccessArrayfromAnotherClass();

instance.saveItem('Foo');
instance.saveItem('Bar');

console.log(instance.items);

＆＃13;

＆＃13;

＆＃13;