根据您的需要，这是“同步”或“异步”的两个选项。
var fs = require('fs');function readWriteAsync() { fs.readFile('filelist.txt', 'utf-8', function(err, data){ if (err) throw err; var newValue = data.replace(/^./gim, 'myString'); fs.writeFile('filelistAsync.txt', newValue, 'utf-8', function (err) { if (err) throw err; console.log('filelistAsync complete'); }); });}function readWriteSync() { var data = fs.readFileSync('filelist.txt', 'utf-8'); var newValue = data.replace(/^./gim, 'myString'); fs.writeFileSync('filelistSync.txt', newValue, 'utf-8'); console.log('readFileSync complete');}readWriteAsync();readWriteSync();
