'line' 事件

每当 input 流接收到行尾输入（\n、\r 或 \r\n）时，则会触发 'line' 事件。

使用包含单行接收输入的字符串调用监听器函数。

rl.on('line', (input) => {
  console.log(`Received: ${input}`);
});

The 'line' event is emitted whenever the input stream receives an end-of-line input (\n, \r, or \r\n). This usually occurs when the user presses the <Enter>, or <Return> keys.

The listener function is called with a string containing the single line of received input.

rl.on('line', (input) => {
  console.log(`Received: ${input}`);
});