如何在Javascript中删除继承的对象值？

Question

我在 Nodejs 中从数据库（使用 Mongoose 的 Mongodb）获取用户结果。 现在我想删除用户结果中的一些键。但无法删除其属性。 找了好多次都没找到删除的办法

例子：-

文件1.js 通过 mongo 查询获取用户

userModel.findOne(query, projection)
      .then(function (result) {
          if (result)
              return result;
          return false
      })

上述查询从数据库中获取结果，结果如下所示

user = {
 f_name: "Vikas",
 l_name: "Kohli",
 key1: "abcD",
 key2: "dhdhdh"

}

文件2.js

user = {
     f_name: "Vikas",
     l_name: "Kohli",
     key1: "abcD",
     key2: "dhdhdh"

    }
 inputuser = "dfdfhdfgy"

使用用户结果的key1创建用户密钥然后比较

(_.isEqual(userkey, user.key2)){
 //call to next file
}else{
//send response as key not matched
}

做一些逻辑，获取用户的密钥，然后使用 key2 做一些加密方法

最后将 key2 与 userResullt key 2（我从数据库中获取）进行比较 如果没问题，则传递到下一个函数

文件3.js 预期输出：-

user = {
         f_name: "Vikas",
         l_name: "Kohli"
        }

当前情景：-

user = {
         f_name: "Vikas",
         l_name: "Kohli",
         key1: "abcD"
         key2: "dhdhdh"

        }

现在想要发送带有已删除键 1 和键 2 的用户结果的响应，但无法删除该键

delete 关键字不会删除继承的属性，但是如果你删除一个原型属性，它会影响从原型继承的所有对象。 （来自 w3schools，developer.mozilla）

还找到了一些有用的链接，但没有一个对我有用。我怎样才能做到这一点？

Clarification on the inability of javascript deleting inherited properties.

Why delete operator returns true even if property wasn't deleted from an object

Answer 1

delete在mongoose返回的模型上不起作用，但转换为object后可以删除。

user = user.toObject();
delete user.key1;
delete user.key2;

Answer 2

您可以从现有对象创建一个新对象，并获取您需要的属性：

let user = {
    f_name: "Vikas",
    l_name: "Kohli",
    key1: "abcD",
    key2: "dhdhdh"
}

user = (({f_name, l_name}) => ({f_name, l_name}))(user);

console.log(user);

如果您有很多属性要保留，而只有少数要拒绝，那么您可以像这样列出要拒绝的属性：

let user = {
    f_name: "Vikas",
    l_name: "Kohli",
    key1: "abcD",
    key2: "dhdhdh"
}

const reject = new Set(["key1", "key2"]);
user = Object.assign(...Object.entries(user)
                              .filter(([k,v]) => !reject.has(k))
                              .map(([k,v]) => ({[k]: v})));

console.log(user);

Answer 3

用户对象中存在逗号语法错误，更正并应用删除运算符

user = {
 f_name: "Vikas",
 l_name: "Kohli",
 key1: "abcD",
 key2: "dhdhdh"
}

delete user.key1
delete user.key2