writeStream.path

流写入的文件路径，如 fs.createWriteStream() 的第一个参数所指定。如果 path 作为字符串传入，则 writeStream.path 将是一个字符串。如果 path 作为 <Buffer> 传入，则 writeStream.path 将是一个 <Buffer>。

【The path to the file the stream is writing to as specified in the first argument to fs.createWriteStream(). If path is passed as a string, then writeStream.path will be a string. If path is passed as a <Buffer>, then writeStream.path will be a <Buffer>.】