使用node.js更改文件

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();