refer to: https://stackoverflow.com/questions/24387451/how-can-i-kill-whatever-process-is-using-port-8080-so-that-i-can-vagrant-up/24388281
怎么解决端口被占用的问题？
events.js:292
throw er; // Unhandled 'error' event
^
Error: listen EADDRINUSE: address already in use :::3000
