code: public JsonObject<V> addData(String key, Object value) {
          if (key == null) {
              return this;
          }
          if (this.data == null) {
              this.data = new HashMap<String, Object>();
          }
          this.data.put(key, value);
          return this;
      }
docs: 添加结果数据
  
  @param key
  键
  @param value
  值