深度克隆

  // 复制的对象的方式
  // 浅度复制
  let obj = {username: ‘kobe‘, age: 39, sex: {option1: ‘男‘, option2: ‘女‘}};
  let obj1 = obj;
  console.log(obj1);
  obj1.sex.option1 = ‘不男不女‘; // 修改复制的对象会影响原对象
  console.log(obj1, obj);
  
  console.log(‘-----------‘);
  // Object.assign();  浅复制
  let obj2 = {};
  Object.assign(obj2, obj);
  console.log(obj2);
  obj2.sex.option1 = ‘男‘; // 修改复制的对象会影响原对象
  console.log(obj2, obj);

  // 深度克隆(复制)

  function getObjClass(obj) {
    let result = Object.prototype.toString.call(obj).slice(8, -1);
    if(result === ‘Null‘){
      return ‘Null‘;
    }else if(result === ‘Undefined‘){
      return ‘Undefined‘;
    }else {
      return result;
    }
  }
  // for in 遍历数组的时候遍历的是下标
  let testArr = [1,2,3,4];
  for(let i in testArr){
    console.log(i); // 对应的下标索引
  }

  // 深度克隆
  function deepClone(obj) {
    let result, objClass = getObjClass(obj);
    if(objClass === ‘Object‘){
      result = {};
    }else if(objClass === ‘Array‘){
      result = [];
    }else {
      return obj; // 如果是其他数据类型不复制，直接将数据返回
    }
    // 遍历目标对象
    for(let key in obj){
      let value = obj[key];
      if(getObjClass(value) === "Object" || ‘Array‘){
        result[key] = deepClone(value);
      }else {
        result[key] = obj[key];
      }
    }
    return result;
  }
  
  
  let obj3 = {username: ‘kobe‘,age: 39, sex: {option1: ‘男‘, option2: ‘女‘}};
  let obj4 = deepClone(obj3);
  console.log(obj4);
  obj4.sex.option1 = ‘不男不女‘; // 修改复制后的对象不会影响原对象
  console.log(obj4, obj3);