事件：'错误'
【Event: 'error'】
error<Error>
当监视文件时发生错误时触发。发生错误的 <fs.FSWatcher> 对象在事件处理程序中不再可用。
【Emitted when an error occurs while watching the file. The errored <fs.FSWatcher> object is no longer usable in the event handler.】
【Event: 'error'】
error <Error>当监视文件时发生错误时触发。发生错误的 <fs.FSWatcher> 对象在事件处理程序中不再可用。
【Emitted when an error occurs while watching the file. The errored <fs.FSWatcher> object is no longer usable in the event handler.】