事件：'write'
【Event: 'write'】
当写操作完成时，会触发 'write' 事件。写入的字节数作为第一个参数传递给事件处理程序。
【The 'write' event is emitted when a write operation has completed. The number
of bytes written is passed as the first argument to the event handler.】
【Event: 'write'】
当写操作完成时，会触发 'write' 事件。写入的字节数作为第一个参数传递给事件处理程序。
【The 'write' event is emitted when a write operation has completed. The number
of bytes written is passed as the first argument to the event handler.】