深拷贝

最新推荐文章于 2019-06-06 11:19:22 发布

原创最新推荐文章于 2019-06-06 11:19:22 发布 · 202 阅读

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本文深入解析了深拷贝函数的实现细节，涵盖了日期、数组、函数及对象等类型的拷贝处理，确保数据结构的完整复制。

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function deepClone(obj) {
  var copy;

  // Handle the 3 simple types, and null or undefined
  if (null == obj || "object" != typeof obj) return obj;

  // Handle Date
  if (obj instanceof Date) {
    copy = new Date();
    copy.setTime(obj.getTime());
    return copy;
  }

  // Handle Array
  if (obj instanceof Array) {
    copy = [];
    for (var i = 0, len = obj.length; i < len; i++) {
        copy[i] = deepClone(obj[i]);
    }
    return copy;
  }

  // Handle Function
  if (obj instanceof Function) {
    copy = function() {
      return obj.apply(this, arguments);
    }
    return copy;
  }

  // Handle Object
  if (obj instanceof Object) {
      copy = {};
      for (var attr in obj) {
          if (obj.hasOwnProperty(attr)) copy[attr] = deepClone(obj[attr]);
      }
      return copy;
  }

  throw new Error("Unable to copy obj as type isn't supported " + obj.constructor.name);
}