将对象的键值对添加到另一个对象中

Question

是否可以在初始化时将一个对象的特定键值对添加到另一个对象？

const a = {
    android: {
        time: null,
        diff: null
   }
};

const b = {
    out:{
       x: null,
       context:{
           state: null,
           value: null,
           "a.android key-value pairs right here: 
            time: null,
            diff: null"
       }
    }
 };

Answer 1

您可以合并两个对象，例如：

Object.assign(b.out.context, a.android)

const a = {
    android: {
        time: null,
        diff: null
   }
};

let b = {
    out:{
       x: null,
       context:{
           state: null,
           value: null,
            time: 1,
            diff: null
       }
    }
 };
 
Object.assign(b.out.context, a.android);
console.log(b);

UPD

如果要在初始化时执行此操作，则可以使用 ... （扩展）运算符：

const a = {
    android: {
        time: 1,
        diff: 2
   }
};

let b = {
    out:{
       x: null,
       context:{
           state: null,
           value: null,
           time: 3,
           diff: 4,
           ...a.android
       }
    }
 };
 

console.log(b);