/**? * Module dependencies?**/var fs = require("fs") ,stdin = process.stdin ,stdout = process.stdout; var stats = [];fs.readdir(process.cwd(),function ?(err, files) { console.log(''); if(!files.length){ return console.log(' ? \033[31m No files to show!\033[39m\n'); } console.log(' ? Select which file or directory you want to see\n'); function file(i){ var filename = files[i]; fs.stat(__dirname + '/' + filename, function ?(err, stat) { stats[i] = stat; if(stat.isDirectory()){ console.log(' ? ?'+i+' ? ?\033[36m' + filename + '/\033[39m'); }else{ console.log(' ? ?'+i+' ? ?\033[90m' + filename + '\033[39m'); } i++; if (i == files.length) { read(); }else{ file(i); } }); } file(0);});function read () { console.log(''); stdout.write(' ? ?\033[33mEnter your choise: \033[39m'); stdin.resume(); stdin.setEncoding('utf8'); stdin.on('data', option);}function option (data) {var filename = files[Number(data)]; if(!filename){ stdout.write(' ? \033[31mEnter your choise: \033[39m'); }else{ stdin.pause(); fs.readFile(__dirname + '/' + filename, 'utf8',function ?(err, data) { if(stats[Number(data)].isDirectory()){ fs.readdir(__dirname + '/' + filename, function (err, files) { console.log(''); console.log(' ? ?('+ files.length + ' files)'); files.forEach(function ?(file) { console.log(' ? ? - ?'+ file); }); console.log(''); }) }else{ fs.readFile(__dirname + '/' + filename, 'utf8', function ?(err ,data) { console.log(''); console.log('\033[90m' + data.replace(/(.*)/g, ' ? ? $1')+ '\033[39m'); }) } })為什么報錯，下劃線代碼的files is not defined?