服务器推送事件的详细介绍

 H5页面需添加如下JS代码：     

 　　　　/// 
/// 推送消息/// 
///         [HttpGet]public HttpResponseMessage SentNews()
        {
            HttpResponseMessage respOnse= Request.CreateResponse(HttpStatusCode.OK);try{//response.Headers.Add("Access-Control-Allow-Origin", "*");//如需要跨域可配置string data_str = “推送至客户端的数据”;//当然可以是json字符串格式string even = "", data = "";if (!string.IsNullOrWhiteSpace(data_str))
                {
                    even = "event:sentMessage\n";
                    data = "data:" + data_str + "\n\n";
                }string retry = "retry:" + 1000 + "\n";//连接断开后重连时间（毫秒），其实可以理解为轮询时间 2333...byte[] array = Encoding.UTF8.GetBytes(even + data + retry);
                Stream stream_result = new MemoryStream(array);
                response.COntent= new StreamContent(stream_result);
                response.Content.Headers.COntentType= new MediaTypeHeaderValue("text/event-stream");//此处一定要配置response.Headers.CacheCOntrol= new CacheControlHeaderValue();
                response.Headers.CacheControl.NoCache = false;
            }catch (Exception ex)
            {
                LogHelper.WriteWebLog(ex);
            }return response;
        }