'finish' 事件
'finish'
事件来自 stream.Writable
类。
'finish'
事件在调用 stream.end()
并且所有块都已被 stream._transform()
处理后触发。
在出现错误的情况下,不应触发 'finish'
。
The 'finish'
event is from the stream.Writable
class. The 'finish'
event is emitted after stream.end()
is called and all chunks
have been processed by stream._transform()
. In the case
of an error, 'finish'
should not be emitted.