net.Socket 具有该属性, socket.write() 工作时需要。它可以帮助用户快速启动和运行。计算机(处理速度)不能总是跟上 socket 的写入速度 - 网络连接可能太慢了。 Node.js 内部将维护一个写入 socket 的数据队列,并在可能的时候将数据发送出去。(内部实现是对 socket 的文件描述符进行轮询其是否是可写状态。)


对处理大量或持续增长的 bufferSize 有经验的用户应该注意使用 socket.pause() and socket.resume() 对他们程序中的数据流进行节流。

net.Socket has the property that socket.write() always works. This is to help users get up and running quickly. The computer cannot always keep up with the amount of data that is written to a socket - the network connection simply might be too slow. Node.js will internally queue up the data written to a socket and send it out over the wire when it is possible. (Internally it is polling on the socket's file descriptor for being writable).

The consequence of this internal buffering is that memory may grow. This property shows the number of characters currently buffered to be written. (Number of characters is approximately equal to the number of bytes to be written, but the buffer may contain strings, and the strings are lazily encoded, so the exact number of bytes is not known.)

Users who experience large or growing bufferSize should attempt to "throttle" the data flows in their program with socket.pause() and socket.resume().