实现一个深拷贝

[ankeji]

const deepCopy = (originObj, property) => { const map = new WeakMap(); function dp(obj) { const result = Array.isArray(obj) ? [] : {}; const existObj = map.get(obj); if (existObj) { return existObj; } map.set(obj, result); for (let key of Reflect.ownKeys(obj)) { // 只需要加一个检测，看看key是不是我们需要的属性就行 if (obj.hasOwnProperty(key) && key === property) { if (obj[key] && typeof obj[key] === 'object') { result[key] = dp(obj[key]) } else { result[key] = obj[key]; } } } return result; } return dp(originObj); }

[shiyachuang]

const deepClone = (data) => {
   var obj;
   if (isArray(data)) {
      obj = [];
   } else if (isObject(data)) {
      obj = {};
   } else {
      //不再具有下一层次
      return data;
   }
   if (isArray(data)) {
      for (var i = 0, len = data.length; i < len; i++) {
         obj.push(deepClone(data[i]));
      }
   } else if (isObject(data)) {
      for (var key in data) {
         obj[key] = deepClone(data[key]);
      }
   }
   return obj;
};

> 

[bc-baicha]

function demo(obj) { if (typeof obj !== 'object') return obj; let result = obj instanceof Array ? [] : {}; for (const key in obj) { result[key] = typeof obj[key] === 'object' ? demo(obj[key]) : obj[key]; } return result; }

[soliderMan]

function deepClone(obj){ var rest=JSON.parse(JSON.sringify(obj)); return rest; }

[ankeji]

只能一级拷贝

发自我的iPhone

在 2021年3月22日，11:36，soliderMan @.***> 写道：

 function deepClone(obj){ var rest=JSON.parse(JSON.sringify(obj)); return rest; }

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[aRidiculousBoy]

function deepClone(obj) { if (typeof obj !== 'object' || obj == null) { return obj } var res if (Array.isArray(obj)) { res = [] } else { res = {} } for (const key in obj) { if (obj.hasOwnProperty(key)) { res[key] = deepClone(obj[key]) } } return res }

[ainuo5213]

function deepClone(obj = {}) {
    if (typeof obj !== "object" || obj == null) return obj;
    let result = obj instanceof Array ? [] : ({});
    for (const key in obj) {
        if (obj.hasOwnProperty(key)) {
            result[key] = deepClone(obj[key]);
        }
    }

    return result;
}

[aotemj]

function deepClone(obj, hash = new WeakMap()) {
  if (obj === null) {
    return obj
  }

  if (obj instanceof Date) {
    return new Date(obj)
  }

  if (obj instanceof RegExp) {
    return new RegExp(obj)
  }
  if (obj instanceof Error) {
    return new Error(obj.message)
  }

  if (typeof obj !== 'object') {
    return obj
  }
  // 防止循环引用
  if (hash.has(obj)) {
    return hash.get(obj)
  }

  hash.set(obj, obj)

  let newObj = Object.create(null)
  const keys = Reflect.ownKeys(obj)
  for (const key of keys) {
    const val = obj[key]
    if (typeof val === 'object') {
      newObj[key] = deepClone(val, hash)
    } else {
      newObj[key] = val
    }
  }

  return newObj
}

[ThenMorning]

function deepClone(obj, hash = new WeakMap()) {
  if (obj === null) {
    return obj
  }

  if (obj instanceof Date) {
    return new Date(obj)
  }

  if (obj instanceof RegExp) {
    return new RegExp(obj)
  }
  if (obj instanceof Error) {
    return new Error(obj.message)
  }

  if (typeof obj !== 'object') {
    return obj
  }
  // 防止循环引用
  if (hash.has(obj)) {
    return hash.get(obj)
  }

  hash.set(obj, obj)

  let newObj = Object.create(null)
  const keys = Reflect.ownKeys(obj)
  for (const key of keys) {
    const val = obj[key]
    if (typeof val === 'object') {
      newObj[key] = deepClone(val, hash)
    } else {
      newObj[key] = val
    }
  }

  return newObj
}

Array