'line' 事件

每当 input 流接收到行尾输入（\n、 \r 或 \r\n）时就会触发 'line' 事件。 这种情况通常发生在当用户按下 Enter 或 Return。

调用监听器函数时会带上包含接收到的那一行输入的字符串。

rl.on('line', (input) => {
  console.log(`接收到：${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 Enter or Return.

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

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