如何在渲染部分中定义对象？

var person = {
  name: "John",
  age: 30,
  sayHello: function() {
    console.log("Hello!");
  }
};

function Person(name, age) {
  this.name = name;
  this.age = age;
  this.sayHello = function() {
    console.log("Hello!");
  };
}

var person = new Person("John", 30);

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

  sayHello() {
    console.log("Hello!");
  }
}

var person = new Person("John", 30);