javascript类中的类变量

class MyClass {
  static staticVar = "I am a static variable";

  constructor() {
    console.log(MyClass.staticVar);
  }
}

const myInstance = new MyClass(); // 输出 "I am a static variable"
console.log(MyClass.staticVar); // 输出 "I am a static variable"

class MyClass {
  instanceVar = "I am an instance variable";

  constructor() {
    console.log(this.instanceVar);
  }
}

const myInstance = new MyClass(); // 输出 "I am an instance variable"
console.log(myInstance.instanceVar); // 输出 "I am an instance variable"