伙计们，我正试图通过阅读Node.js文档来学习Node.js。
我首先开始学习fs模块
在学习的过程中，我看到了这样的解释：
mode是一个可选整数，用于指定复制操作的行为。可以创建由两个或更多个值的按位OR组成的掩码（例如，fs.constants.COPYFILE_EXCL | fs.constants.COPYFILE_FICLONE）。
https://nodejs.org/api/fs.html#fscopyfilesrc-dest-mode-callback
我不明白COPYFILE_FICLONE和COPYFILE_FICLONE_FORCE是干什么用的，为什么我们要使用这两种模式
我研究了“写时复制”是如何工作的”，发现了这些网站：

• https://www.geeksforgeeks.org/copy-on-write/
• https://www.computerhope.com/jargon/c/copy-on-write.htm

我还是不明白
也许我认为你们可以帮助我，我能理解为什么

//*  Module   *//
let fs = require('fs');

//* Variables *//
source = 'source.txt';
destination = 'hesyy.txt';

//* call back function for error *//
function callback(err) {
    if (!err){
        console.log("source.txt copied to destination");
    } else throw err;
}

// the copy operation will fail if dest already exists.
const {COPYFILE_EXCL} = fs.constants;
// 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.
const {COPYFILE_FICLONE} = fs.constants;
 // 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.
const {COPYFILE_FICLONE_FORCE} = fs.constants;

// fs.copyFile(source,destination,callback);
// fs.copyFile(source,destination,COPYFILE_EXCL,callback);
// fs.copyFile(source,destination,COPYFILE_FICLONE,callback);
fs.copyFile(source,destination,COPYFILE_FICLONE_FORCE,err => {
    if (!err) {
        console.log("Copied");
    }else{
        console.log("err yo:",err);
    }
});

running：node copyFile.js and I got an error by using COPYFILE_FICLONE_FORCE：

err yo: [Error: ENOSYS: function not implemented, copyfile 'C:\Users\CENSORED\Desktop\nodejss\fs\fs.copyFile\source.txt' -> 'C:\Users\CENSORED\Desktop\nodejss\fs\fs.copyFile\hessyy.txt'] {
  errno: -4054,
  code: 'ENOSYS',
  syscall: 'copyfile',
  path: 'C:\\Users\\CENSORED\\Desktop\\nodejss\\fs\\fs.copyFile\\source.txt',
  dest: 'C:\\Users\\CENSORED\\Desktop\\nodejss\\fs\\fs.copyFile\\hessyy.txt'
}