事件：'drop'

¥Event: 'drop'

当达到最大长度且数据将无法写入时，会触发 'drop' 事件。丢弃的数据将作为事件句柄的第一个参数传递。

¥The 'drop' event is emitted when to maximal length is reached and that data will not be written. The data that was dropped is passed as the first argument to the event handle.