（1）创建 test.cjs 文件

（2）代码

const {readFileSync,writeFileSync} = require('fs');
const {dirname} = require('path');
const chunkSize = 1024 * 8;                               // 切片大小
const path = 'C:\\Users\\cat\\Desktop\\test\\1.txt';    // 文件全路径
let chunkCount = 0;
function slice (){const fileData= readFileSync(path);chunkCount = Math.ceil(fileData.length / chunkSize);for (let i = 0; i < chunkCount; i++) {let chunkStart = i * chunkSize;let chunkEnd = Math.min(fileData.length, (i + 1) * chunkSize);const  chunk=fileData.buffer.slice(chunkStart, chunkEnd);writeFileSync(dirname(path)+'\\'+i, Buffer.from(chunk));}
}function merge(){for(let i=0;i<chunkCount;i++){const arr= readFileSync(dirname(path)+'\\'+i);writeFileSync('C:\\Users\\cat\\Desktop\\test\\2.txt', arr, { flag: 'a+' });}
}slice();merge()

（3）打开Windows PowerShell

（4）cd到test.cjs所在目录，执行 node .\test.cjs

（5）打开文件夹，查看切片，及生成的文件