nodes 交互

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);
});