浅拷贝：创建一个新对象，并复制原有对象的基本类型的值

1.Object.assgin(target,source)

let target = [1,2,3]
let source = []
Object.assgin(target,source)

2.扩展运算符{...targetObj} / [...targetArr]

let target = [1,2,3]
let source = [...target]

3.arr.concat()

let target = [1,2,3]
let source = target.concat()

4.arr.slice(begin,end)

let target = [1,2,3]
let source = target.slice()

注：后两者仅用于数组

手写浅拷贝函数

const shaloowClone=(target)=>{
    if(typeof target === 'object' && target !== null){//判断数据类型
        const cloneTarget = Array.isArray(target)?[]:{}//判断是否为数组，创建新变量
        for(let prop in target){//变量原对象
            if(target.hasOwnProperty(prop)){ //判断原对象是否拥有该属性
                cloneTarget[prop] = target[prop] //新对象属性复制
            }
        }
        return cloneTarget
    }else{
        return target
    }
}