dir.close()

• 返回：<Promise>

异步关闭目录的底层资源句柄。随后进行的读取操作将导致错误。

【Asynchronously close the directory's underlying resource handle. Subsequent reads will result in errors.】

返回一个承诺，该承诺将在资源关闭后兑现。

【A promise is returned that will be fulfilled after the resource has been closed.】