Javascript提供令人困惑的输出

我是Java语言的新手，来自Java背景。

const person = {
  name: "bin",
  walk() {
    console.log(this);
  }
};
person.walk();
const per1 = person;
per1.name = "cin";
per1.walk();

const animal = {
  type: "2",
  m2() {
    console.log("type");
  }
};
const walk1 = person.walk.bind(animal);
walk1();
person.walk();

我无法理解第1行的输出，该输出显示name的值cin。当代码在person.walk（）处执行时；名称的值未更改。然后如何将值打印为cin。请帮我理解

{name: "bin", walk: ƒ}name: "cin"walk: ƒ walk()__proto__: Object
{name: "cin", walk: ƒ}name: "cin"walk: ƒ walk()__proto__: Object
{type: "2", m2: ƒ}type: "2"m2: ƒ m2()__proto__: Object
{name: "cin", walk: ƒ}name: "cin"walk: ƒ walk()__proto__: Object