我的应用输出的是[object Object]，而不是文本字符串--该怎么解决？

let obj = { name: "John", age: 30 };
console.log(JSON.stringify(obj)); // 输出: {"name":"John","age":30}

class Person {
  constructor(name, age) {
    this.name = name;
    this.age = age;
  }

  toString() {
    return `Person { name: ${this.name}, age: ${this.age} }`;
  }
}

let person = new Person("John", 30);
console.log(person.toString()); // 输出: Person { name: John, age: 30 }

let obj = { name: "John", age: 30 };
console.log(`Name: ${obj.name}, Age: ${obj.age}`); // 输出: Name: John, Age: 30

let arr = ["apple", "banana", "cherry"];
console.log(arr.join(", ")); // 输出: apple, banana, cherry

console.log(obj); // 输出对象的详细内容