新增signalR连接

ZR.Vue/src/utils/signalR.js

@@ -0,0 +1,49 @@
+// 官方文档：https://docs.microsoft.com/zh-cn/aspnet/core/signalr/javascript-client?view=aspnetcore-6.0&viewFallbackFrom=aspnetcore-2.2&tabs=visual-studio
+import * as signalR from '@microsoft/signalr'
+import store from '../store'
+
+export default {
+  // signalR对象
+  SR: {},
+  // 失败连接重试次数
+  failNum: 4,
+  baseUrl: '',
+  init(url) {
+    const connection = new signalR.HubConnectionBuilder()
+      .withUrl(url)
+      .build();
+    // console.log('conn', connection);
+    this.SR = connection;
+
+    // 断线重连
+    connection.onclose(async () => {
+      await this.SR.start();
+    })
+
+    connection.on("onlineNum", (data) => {
+			store.dispatch("socket/changeOnlineNum", data);
+    });
+    // 启动
+    this.start();
+  },
+  async start() {
+    var that = this;
+
+    try {
+      //使用async和await 或 promise的then 和catch 处理来自服务端的异常
+
+      await this.SR.start();
+
+      //console.assert(this.SR.state === signalR.HubConnectionState.Connected);
+      console.log('signalR 连接成功了', this.SR.state);
+    } catch (error) {
+      that.failNum--;
+      console.log(`失败重试剩余次数${that.failNum}`, error)
+      if (that.failNum > 0) {
+        setTimeout(async () => {
+          await this.SR.start()
+        }, 5000);
+      }
+    }
+  }
+}