js深拷贝实现

使用json.stringify实现深拷贝有哪些坑。

这篇总结得比较好了

实现:

  function deepClone(obj) {
      if (null == obj || "object" != typeof obj) return obj;
      if (obj instanceof Array) {
          var copy = [];
          for (var i = 0, len = obj.length; i < len; i++) {
              copy[i] = deepClone(obj[i]);
          }
          return copy;
      }
      if (obj instanceof Date) {
          var copy = new Date();
          copy.setTime(obj.getTime());
          return copy;
      }
      if(obj instanceof RegExp){
        return new RegExp(obj);
      }
      if (obj instanceof Object) {
          var copy = {};
          for (var attr in obj) {
              if (obj.hasOwnProperty(attr)) copy[attr] = deepClone(obj[attr]);
          }
          return copy;
      }
      throw new Error("Unable to copy obj this object.");
  }