添加路由复用策略

src/app/app.module.ts

@@ -1,5 +1,6 @@
 import { BrowserModule } from '@angular/platform-browser';
-import { BrowserAnimationsModule } from '@angular/platform-browser/animations'
+import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
+import { RouteReuseStrategy } from '@angular/router';
 import { NgModule } from '@angular/core';
 import { CommonModule } from '@angular/common'
 import { HttpClientModule } from '@angular/common/http'
@@ -25,6 +26,9 @@ import { LoginAuthService } from './services/login-auth.service';
 /* websocket */
 import { WebsocketService } from './services/websocket.service';
 
+/* 路由缓存策略 */
+import { AppReuseStrategy } from './router-reuse-strategy';
+
 @NgModule({
     declarations: [
         AppComponent
@@ -43,7 +47,8 @@ import { WebsocketService } from './services/websocket.service';
         LoginAuthService,
         HttpService,
         HttpClientService,
-        WebsocketService
+        WebsocketService,
+        { provide: RouteReuseStrategy, useClass: AppReuseStrategy }
     ],
     bootstrap: [AppComponent]
 })