服务器推技术:如果浏览器支持websocket则会调用websocket进行通信，如果不支持，自动转为长轮询的方式-Server push technology: If the browser supports websocket websocket communication will be called, if not support, automatically converted to long polling mode

SingalR例子，Hub实现通讯功能，页面显示效果(SingalR example, Hub to realize communication function, page display effect)

web客户端与服务端实现实时信息推送功能(Web client and server realize real time information push function)

Signalr测试小样，可以直接运行，根据SQLSERVER表更新来触发前端动作(The Signalr test sample can run directly, triggering the front-end action according to the SQLSERVER table update)