add timeout for loading apps.json

app/apps.service.ts

@@ -84,7 +84,9 @@ export class AppsService {
         let appsURL = 'https://api.mycard.moe/apps.json';
         let keysURL = 'https://api.mycard.moe/keys';
         try {
-            let data = await this.http.get(appsURL).map((response) => response.json()).toPromise();
+            let data = await this.http.get(appsURL)
+                .timeout(5000)
+                .map((response) => response.json()).toPromise();
             let keys_data = await this.http.get(keysURL, {
                 search: {
                     user_id: this.loginService.user.email
@@ -102,6 +104,7 @@ export class AppsService {
             console.error(e);
             let data = localStorage.getItem('apps_json');
             if (data) {
+                new Notification('MyCard', {body: '读取最新游戏列表失败...'});
                 this.apps = this.loadAppsList(JSON.parse(data!));
             } else {
                 alert('读取游戏列表失败，可能是网络不通');