使用展开运算符合并color数组到CoverColor及合并dataAdditionalBook到book对象

let color = ["blue", "red", "yellow" , "green"]

let dataAdditionalBook= {
   Author: "John Doe",
   PublishYear: 2020
}

let book = {
   Name: "basic programming",
   NumberOfPages: 172,
   CoverColor:["black"]
}
// the above code should not be changed or deleted at all

/* Write the answer code here */
// 1. 合并color数组到book的CoverColor属性
book.CoverColor = [...book.CoverColor, ...color]
// 2. 合并dataAdditionalBook的所有属性到book对象
book = {...book, ...dataAdditionalBook}

• 数组合并：使用展开运算符...分别展开book原有CoverColor数组和color数组，拼接为新数组后赋值回book.CoverColor，不会修改color变量的原始值，符合要求
• 对象合并：使用展开运算符依次展开原有book对象和dataAdditionalBook对象，后者的属性会自动合并到前者中，当前场景无同名属性冲突，实现效果符合需求

内容的提问来源于stack exchange，提问作者Faizal Anwar