node express+socket.io实现聊天室

参照网址：/article/135058.htm

/limitcode/p/7845168.html

/developer/article/1330581

/demodashi/p/8512788.html

/demodashi/p/9442972.html

/imwtr/p/4366930.html

连接数据库的：

/blackgan/p/6937568.html