嗨哆嚒

let a = [1,2,3];
let b = a;
b[0] = 0;
console.log(a); //[0,2,3]
console.log(b); //[0,2,3]
//對象同理

//數組
let a = [1,2,3];
let b = [...a];
b[0] = 0;
console.log(a) //[1，2，3]
console.log(b) //[0，2，3]


//對象
//方法一，json字符串，缺點，不好處理函數
let obj = {name:"張三"};
let obj1=JSON.parse(JSON.stringify(obj)); 
obj1.name = "李四";
console.log(obj);//{name:"張三"};
console.log(obj1);//{name:"李四"};

//方案二:遞歸解析法

function copyObject(obj){
  let newObj = obj.constructor === Array?[]:{};
  for(var i in obj){
    if(typeof obj[i] === 'object'){
      newObj[i] = arguments.callee(obj[i]);
    }
    else{
      newObj[i]=obj[i];
    }
  }
  return newObj;
}
function copyAll(type){
  let obj2;
  if(typeof type === 'object'){
    obj2 = copyObject(type);
  }else{
    obj2 = type;
  }
  return obj2;
}