前端面试-深拷贝

递归

let deepClone = function(o){
  let result = Array.isArray(o)?[]:{}
  for(let k in o ){
    if(o[k] instanceof Array||o[k] instanceof Object){
      result[k] = deepClone(o[k])
    }else{
      result[k]=o[k]
    }
  }
  return result
}

JSON

let deepClone = function(o){
  return JSON.parse(JSON.stringify(o))
}