系统管理角色，用户，部门内部分字段长度控制

src/app/services/websocket.service.ts

@@ -7,6 +7,7 @@ var SECURE = 'wss://';
 
 export class WebsocketService {
     public websocket: WebSocket;
+    public websocketHeartBeat;
     constructor() { }
 
     dynamicsMessage() {
@@ -19,7 +20,11 @@ export class WebsocketService {
         this.websocket = new WebSocket(url);
         return new Observable(ob => {
             this.websocket.onopen = () => {
-                console.log('websocket was connected...')
+                console.log('websocket was connected...');
+                this.websocketHeartBeat = setInterval(() => {
+                    let msg = { "topic": "heart-beat", "message": "" };
+                    this.websocket.send(JSON.stringify(msg));
+                }, 30000);
             }
             this.websocket.onmessage = (event) => {
                 ob.next(event.data)
@@ -33,4 +38,8 @@ export class WebsocketService {
             }
         })
     }
+
+    clearIntervalHandle() {
+        clearInterval(this.websocketHeartBeat);
+    }
 }