如何在javascript中的另一个类中实例化类？

Question

如何在javascript中的另一个类中实例化类？一个类有静态和非静态方法export default class MyClass {    static staticMethod() {        return console.log(`this is static method`);    }    nonStaticMethod() {        return console.log(`this is not static method`);    }}我可以在其他一些 js 文件中从上面访问静态方法，它是这样的类：import MyClass form "somewhere";MyClass.staticMethod(); //this works 但是如何访问非静态方法？//This does not workimport MyClass form "somewhere";MyClass.nonStaticMethod();为了使其工作，需要创建/传递 MyClass 的实例。我怎么能做这样的事情？let myClass = new MyClass();myClass.nonStaticMethod();//I am getting uncaught ReferenceError: nonStaticMethod is not defined

Answer 1

创建类的实例，然后调用实例方法。您不能像那样从静态上下文中调用实例方法。请参阅下面的示例代码：

class ClassA {

  static staticMethod() {

    return 'this is static method';

  }

  nonStaticMethod() {

    return 'this is not static method';

  }

}

//Call static method:

console.log(ClassA.staticMethod()); //Works as expected

//ClassA.nonStaticMethod(); // Uncomment and see it Will cause a Uncaught TypeError

//Call instance method:

const instance = new ClassA();

//console.log(instance.staticMethod());  // Uncomment and see it Will cause a Uncaught TypeError

console.log(instance.nonStaticMethod()); //Works as expected

Answer 2

我真的没有看到这里有什么问题。这段代码工作得很好。

class myClass {

    static staticMethod() {

        return console.log(`this is static method`);

    }

    nonStaticMethod() {

        return console.log(`this is not static method`);

    }

}

myClass.staticMethod();

let classInstance = new myClass();

classInstance.nonStaticMethod();