对于快速复制，您应该使用fs.常量。COPYFILE_FICLONE国旗。它允许(对于支持此功能的文件系统)不实际复制文件的内容。只创建了一个新的文件条目，但它指向源文件的写时复制“克隆”。

什么都不做/少做是做某事的最快方法;)

https://nodejs.org/api/fs.html#fs_fs_copyfile_src_dest_flags_callback

let fs = require("fs");

fs.copyFile(
  "source.txt",
  "destination.txt",
  fs.constants.COPYFILE_FICLONE,
  (err) => {
    if (err) {
      // TODO: handle error
      console.log("error");
    }
    console.log("success");
  }
);

用承诺代替:

let fs = require("fs");
let util = require("util");
let copyFile = util.promisify(fs.copyFile);


copyFile(
  "source.txt",
  "destination.txt",
  fs.constants.COPYFILE_FICLONE
)
  .catch(() => console.log("error"))
  .then(() => console.log("success"));

   const fs = require("fs");
   fs.copyFileSync("filepath1", "filepath2"); //fs.copyFileSync("file1.txt", "file2.txt");

这是我个人用来复制一个文件和替换另一个文件使用Node.js:)

自Node.js 8.5.0以来，我们有了新的fs. js。copyFile和fs。copyFileSync方法。

使用的例子:

var fs = require('fs');

// File "destination.txt" will be created or overwritten by default.
fs.copyFile('source.txt', 'destination.txt', (err) => {
    if (err) 
        throw err;
    console.log('source.txt was copied to destination.txt');
});

迈克的解决方案，但承诺:

const FileSystem = require('fs');

exports.copyFile = function copyFile(source, target) {
    return new Promise((resolve,reject) => {
        const rd = FileSystem.createReadStream(source);
        rd.on('error', err => reject(err));
        const wr = FileSystem.createWriteStream(target);
        wr.on('error', err => reject(err));
        wr.on('close', () => resolve());
        rd.pipe(wr);
    });
};

使用Node.js内置的复制函数

它提供了异步和同步版本:

const fs = require('fs');

// File "destination.txt" will be created or overwritten by default.
fs.copyFile('source.txt', 'destination.txt', (err) => {
  if (err) 
      throw err;
  console.log('source.txt was copied to destination.txt');
});

fs。copyFileSync(src, dest[， mode])

你可以使用fs-extra模块很容易地做到这一点:

const fse = require('fs-extra');

let srcDir = 'path/to/file';
let destDir = 'pat/to/destination/directory';

fse.moveSync(srcDir, destDir, function (err) {

    // To move a file permanently from a directory
    if (err) {
        console.error(err);
    } else {
        console.log("success!");
    }
});

Or

fse.copySync(srcDir, destDir, function (err) {

     // To copy a file from a directory
     if (err) {
         console.error(err);
     } else {
         console.log("success!");
     }
});