带有箭头功能的可变作用域

Question

过去几天来，我一直在努力解决这个可变范围问题，我希望对此有更多的关注。

if(user.password) {
    bcrypt.genSalt(10).then((salt) => {
        console.log(user);
        let hash = bcrypt.hashSync(user.password, salt);
        console.log(hash);
        user.password = hash;
     })
}

console.log(user);

控制台的预期输出如下：

{firstName: "Jon", lastName: "Snow", password: "winter is coming"}
w028238r2u3r928ur0823qp28r3u2
{firstName: "Jon", lastName: "Snow", password: "w028238r2u3r928ur0823qp28r3u2"}

...但是我得到了...

{firstName: "Jon", lastName: "Snow", password: "winter is coming"}
w028238r2u3r928ur0823qp28r3u2
{firstName: "Jon", lastName: "Snow", password: "winter is coming"}