'error' 事件
如果在写入或管道数据时发生错误，则会触发 'error' 事件。
监听器回调在调用时传入单个 Error 参数。
The 'error' event is emitted if an error occurred while writing or piping
data. The listener callback is passed a single Error argument when called.
The stream is not closed when the 'error' event is emitted unless the
autoDestroy option was set to true when creating the
stream.
