1.浅拷贝
//1.直接赋值给一个变量 //浅拷贝
//2.Object.assign() //浅拷贝
let obj4={}
let obj5={money:50000}
obj4.__proto__ = obj5
console.log(obj4)
console.log(obj4.money)
let obj6 ={name:'kebo',age:40}
console.log(Object.assign(obj5,obj6))
//3.Array.prototype.concat() //浅拷贝
let arr =[1,2,'wede',{userName:'kobe'} ]
let arr2 =arr.concat()
//4.Array.prototype.slice() //浅拷贝
let arr3 =arr.slice()
//5.JSON.parse(JSON.stringify()) //深拷贝
let arr4 =JSON.parse(JSON.stringify(arr))
2.深度拷贝的实现
//1. 判断数据的类型
function checkType(target){
return Object.prototype.toString.call(target).slice(8,-1)
}//2.定义拷贝函数
function clone(target){
let result,targetType =checkType(target);
if( targetType==='Object'){
result = {};
}else if(targetType ==="Array"){
result = [];
}else{
return target;
}
//遍历数据结构中的每一项值
for(let i in target){
let value = target[i]
if(checkType(value)==='Object' || checkType(value)==='Arrary'){
//继续遍历获取到的值
clone(value)
}else{
result[i]=value
}
}
return result;
}