SOURCE

// 浅拷贝-扩展运算符
let outObj = {
  inObj: {a: 1, b: 2}
}
let newObj = {...outObj}
newObj.inObj.a = 2
console.log(outObj) 
// {inObj: {a: 2, b: 2}}

// 浅拷贝-Object.assign()


// 深拷贝
const deepClone = (obj) => {
  if(typeOf obj !== 'object') return
  let newOBj = obj instanceOf Array ? [] : {}
  for (let key in obj) {
    if(typeOf obj[key] === 'object' ){
      newObj[key] = deepClone(obj[key])
    } else {
      newObj[key] = obj[key]
    }
  }
  return newObj
}