事件：'close'

¥Event: 'close'

发生以下情况之一时会触发 'close' 事件：

¥The 'close' event is emitted when one of the following occur:

• rl.close() 方法被调用，InterfaceConstructor 实例放弃了对 input 和 output 流的控制；

  ¥The rl.close() method is called and the InterfaceConstructor instance has relinquished control over the input and output streams;

• input 流接收到它的 'end' 事件；

  ¥The input stream receives its 'end' event;

• input 流接收 Ctrl+D 以表示传输结束（EOT）；

  ¥The input stream receives Ctrl+D to signal end-of-transmission (EOT);

• input 流接收 Ctrl+C 来向 SIGINT 触发信号，并且 InterfaceConstructor 实例上没有注册 'SIGINT' 事件监听器。

  ¥The input stream receives Ctrl+C to signal SIGINT and there is no 'SIGINT' event listener registered on the InterfaceConstructor instance.

调用监听器函数时不传入任何参数。

¥The listener function is called without passing any arguments.

一旦触发 'close' 事件，则 InterfaceConstructor 实例就完成了。

¥The InterfaceConstructor instance is finished once the 'close' event is emitted.