const fs = require('fs')
// fs.rename('./data2.txt','./data3.txt',err=>{ // 重命名文件
// if(err){
// console.log('操作失败')
// }
// console.log('操作成功')
// })
fs.rename('./data3.txt','./bak/data3.txt',err=>{ // 移动文件
if(err){
console.log('操作失败')
}
console.log('操作成功')
})
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