文件复制的常量

以下常量旨在与 fs.copyFile() 一起使用。

常量	描述
`COPYFILE_EXCL`	如果存在，如果目标路径已经存在，复制操作将失败并显示错误。
`COPYFILE_FICLONE`	如果存在，复制操作将尝试创建写时复制引用链接。如果底层平台不支持写时复制，则使用回退复制机制。
`COPYFILE_FICLONE_FORCE`	如果存在，复制操作将尝试创建写时复制引用链接。如果底层平台不支持写时复制，则操作将失败并显示错误。

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.