文件拷贝的常量

以下常量适用于 fs.copyFile()。

常量	说明
`COPYFILE_EXCL`	如果目标路径已存在，则拷贝操作将失败。
`COPYFILE_FICLONE`	拷贝操作将尝试创建写时拷贝链接。如果底层平台不支持写时拷贝，则使用备选的拷贝机制。
`COPYFILE_FICLONE_FORCE`	拷贝操作将尝试创建写时拷贝链接。如果底层平台不支持写时拷贝，则拷贝操作将失败。

The following constants are meant for use with fs.copyFile().

Constant	Description
`COPYFILE_EXCL`	If present, the copy operation will fail with an error if the destination path already exists.
`COPYFILE_FICLONE`	If present, the copy operation will attempt to create a copy-on-write reflink. If the underlying platform does not support copy-on-write, then a fallback copy mechanism is used.
`COPYFILE_FICLONE_FORCE`	If present, the copy operation will attempt to create a copy-on-write reflink. If the underlying platform does not support copy-on-write, then the operation will fail with an error.