javascript基础 -- 判断对象类型 对象的深拷贝

//判断一个是不是JSON对象，1.对象是没长度的,2.类型是对象3.判断是对象的那个类型:object,object
function isJSON(elem){
  console.log(typeof elem);
  console.log(!elem.length);
  console.log(Object.prototype.toString.call(elem)===‘[object object]‘);
  return typeof elem === "object" && !elem.length && Object.prototype.toString.call(elem).toLowerCase()=="[object object]";
}
//判断是不是数组
function isArray(elem){
  if(Array.isArray){
     return Object.prototype.toString.call(elem).toLowerCase() == ‘[object array]‘;
  }else{
    console.log(1);
     return Array.isArray(elem);
  }
}

function isSimpleType(elem){
  return typeof elem === "string" || typeof elem === ‘number‘|| typeof elem === ‘boolean‘;
}

function deepCopyJSON(json){
  if(!isJSON(json)){return ;}
  var newJSON = {};
  for(var key in json){
    if(isJSON(json[key])){
      newJSON[key] = deepCopyJson(json[key])
    }else if(isArray(json[key])){
      newJSON[key] = deepCopyArray(json[key])
    }else{
      newJSON[key] = json[key];
    }
  }
  return newJSON;
}

function deepCopyArray(arr){
  if(!isArray(arr)){return ;}
  var newArr = [];
  console.log(‘isArr‘);
  for(var i=0;i<arr.length;i++){
    if(isJSON(arr[i])){
      // console.log(0);
      newArr[i] = deepCopyJSON(arr[i]);
    }else if(isArray(arr[i])){
      newArr[i] = deepCopyArray(arr[i]);
    }else{
      console.log(0);
      newArr[i] = arr[i];
    }
  }
  return newArr;
}

function deepCopy(obj){
  var newObj;
  if(isArray(obj)){
    newObj = deepCopyArray(obj);
  }else if(isJSON(obj)){
    newObj = deepCopyJson(obj);
  }
  return newObj;
}
    var json1 = {
      ‘a‘:1,
      ‘b‘:‘string‘,
      ‘c‘:true,
      ‘d‘:{
        ‘a‘:11,
        ‘b‘:true,
        ‘c‘:{
          ‘aa‘:false,
          ‘bb‘:‘字符‘
        }
      },
      ‘e‘:[1,4,5,{a:‘555‘,‘b‘:‘hahahah‘}]
    };
    var arr1 = [1,4,‘dddd‘,{‘a‘:‘a‘,‘b‘:‘b‘},[11,33,44,55,{‘t‘:‘t‘,‘y‘:‘y‘}]];

    var arr2=deepCopyArray(arr1);
　　//arr2[4][4].t=3;
   //arr1[4][4].1  输出t