fs.copyFileSync(src, dest[, mode])


    同步地复制 srcdest。 默认情况下,如果 dest 已经存在,则会被覆盖。 返回 undefined。 Node.js 不保证复制操作的原子性。 如果在打开目标文件进行写入后发生错误,Node.js 将尝试删除目标文件。

      Synchronously copies src to dest. By default, dest is overwritten if it already exists. Returns undefined. Node.js makes no guarantees about the atomicity of the copy operation. If an error occurs after the destination file has been opened for writing, Node.js will attempt to remove the destination.

      mode is an optional integer that specifies the behavior of the copy operation. It is possible to create a mask consisting of the bitwise OR of two or more values (e.g. fs.constants.COPYFILE_EXCL | fs.constants.COPYFILE_FICLONE).

      • fs.constants.COPYFILE_EXCL: The copy operation will fail if dest already exists.
      • fs.constants.COPYFILE_FICLONE: The copy operation will attempt to create a copy-on-write reflink. If the platform does not support copy-on-write, then a fallback copy mechanism is used.
      • fs.constants.COPYFILE_FICLONE_FORCE: The copy operation will attempt to create a copy-on-write reflink. If the platform does not support copy-on-write, then the operation will fail.
      import { copyFileSync, constants } from 'node:fs';
      
      // destination.txt will be created or overwritten by default.
      copyFileSync('source.txt', 'destination.txt');
      console.log('source.txt was copied to destination.txt');
      
      // By using COPYFILE_EXCL, the operation will fail if destination.txt exists.
      copyFileSync('source.txt', 'destination.txt', constants.COPYFILE_EXCL);