zsk-fs

``js
const fs = require('fs');
fs.readFile('1.txt', 'utf-8', (err, data) => {
if (err) {
console.log('文件读取失败');
} else {
fs.writeFile('2.txt', data + '呵呵呵', 'utf-8', (error) => {
if (error) {
console.log('文件写入失败');
}
})
}
})
``