const rl = readline.createInterface({ input: process.stdin, output: process.stdout, prompt: '请输入> '});rl.prompt();rl.on('line', function (line){ switch (line.trim()) {case 'hello': console.log('world!'); break; default: console.log('你输入的是:',line.trim()); break;}rl.prompt();}).on('close', function(){ console.log('再见!');process.exit(0);});