如何更改"this“对象

const obj = {
  name: "John",
  changeThis: function() {
    const arrowFunc = () => {
      console.log(this.name); // 输出 "John"
    };
    arrowFunc();
  }
};

obj.changeThis();

const obj1 = {
  name: "John",
  changeThis: function() {
    function printName() {
      console.log(this.name);
    }
    const boundFunc = printName.bind(this);
    boundFunc(); // 输出 "John"
  }
};

obj1.changeThis();

const obj2 = {
  name: "John",
  changeThis: function() {
    function printName() {
      console.log(this.name);
    }
    printName.call(this); // 输出 "John"
  }
};

obj2.changeThis();