'open' 事件
打开 <fs.WriteStream> 的文件时触发。
fd<integer> Integer file descriptor used by the <fs.WriteStream>.
Emitted when the <fs.WriteStream>'s file is opened.
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打开 <fs.WriteStream> 的文件时触发。
fd <integer> Integer file descriptor used by the <fs.WriteStream>.Emitted when the <fs.WriteStream>'s file is opened.
