浅拷贝与深拷贝

浅拷贝

let stu = {
    name:'xiaoming',
    age:10,
    bestFriend:{
        name:'zhangsan',
        age:25
    }
}


function copyObject(obj){
    let newObj = {};
    for (let i in obj){
        newObj[i] = obj[i]
    }
    return newObj
}
let  newStu = copyObject(stu)

console.log(stu)
console.log(newStu)
console.log(stu === newStu)//false

深拷贝

两种方式

1. 递归

   let stu = {
       name:'xiaoming',
       age:10,
       bestFriend:{
           name:'zhangsan',
           age:25
       }
   }
   
   function copyObjects(obj){
       let newObj = {};
       for (let i in obj){
           if (obj[i] instanceof Object){
               newObj[i] = copyObjects(obj[i]);
           }else{
               newObj[i] = obj[i]
           }
       }
       return newObj
   }
   let  newStu2 = copyObjects(stu)
   stu.bestFriend.name = 'lisi'
   console.log(stu)
   console.log(newStu2)
   console.log(stu === newStu2)
   

2. 转JSON

   let stu = {
       name:'xiaoming',
       age:10,
       bestFriend:{
           name:'zhangsan',
           age:25
       }
   }
   
   function copyObjects(obj){
   
       let newStr = JSON.stringify(obj);
       let newObj = JSON.parse(newStr);
       return newObj
   }
   let  newStu2 = copyObjects(stu)
   stu.bestFriend.name = 'lisi'
   console.log(stu)
   console.log(newStu2)
   console.log(stu === newStu2)
   

标签：obj,log,newObj,stu,let,console,拷贝
来源： https://www.cnblogs.com/warm-px/p/16031350.html