将Var从一个javascript类传递到另一个javascript类

class ClassA {
  constructor(varA) {
    this.varA = varA;
  }
}

class ClassB {
  constructor(varB) {
    this.varB = varB;
  }
}

const varA = 'Hello';
const classA = new ClassA(varA);
const classB = new ClassB(classA.varA);
console.log(classB.varB); // 输出 'Hello'

class ClassA {
  setVar(varA) {
    this.varA = varA;
  }
}

class ClassB {
  constructor() {
    this.classA = new ClassA();
  }
  
  passVar(varB) {
    this.classA.setVar(varB);
  }
}

const varB = 'World';
const classB = new ClassB();
classB.passVar(varB);
console.log(classB.classA.varA); // 输出 'World'

class ClassA {
  static varA;
}

class ClassB {
  constructor() {
    this.varB = ClassA.varA;
  }
}

ClassA.varA = 'Hello';
const classB = new ClassB();
console.log(classB.varB); // 输出 'Hello'