diff --git a/src/app/api/api.service.ts b/src/app/api/api.service.ts
index 227b368..5a0d33b 100644
--- a/src/app/api/api.service.ts
+++ b/src/app/api/api.service.ts
@@ -1,10 +1,7 @@
-import {Injectable} from '@angular/core';
-import {HttpClient} from '@angular/common/http';
-
+import {forwardRef, Inject, Injectable} from '@angular/core';
 import {Article} from '../class/Article';
 import {HttpService} from './http/http.service';
 import {PageList} from '../class/HttpReqAndResp';
-import {ErrDispatch} from '../class/ErrDispatch';
 import {ArticleReq} from '../class/Article';
 import {Category, Tag} from '../class/Tag';
 import {Comment} from '../class/Comment';
@@ -12,28 +9,21 @@ import {CommentReq} from '../class/Comment';
 import {ApplyLinkReq, Link} from '../class/Link';
 import {User} from '../class/User';
 import {LoginReq} from '../class/User';
-
-import {LocalStorageService} from '../services/local-storage.service';
 import {Visitor} from '../class/Visitor';
 import {UpdateInfo} from '../class/UpdateInfo';
 
 @Injectable({
     providedIn: 'root'
 })
-export class ApiService extends HttpService {
+export class ApiService {
 
-    constructor(httpClient: HttpClient,
-                localStorageService: LocalStorageService) {
-        super(httpClient, localStorageService);
-    }
 
-    setErrDispatch(errDispatch: ErrDispatch) {
-        super.setErrDispatch(errDispatch);
+    constructor(private httpService: HttpService) {
     }
 
     createArticle(article: ArticleReq) {
         article.id = null;
-        return super.Service<Article>({
+        return this.httpService.Service<Article>({
             path: '/admin/article/create',
             contentType: 'application/json',
             method: 'POST',
@@ -42,7 +32,7 @@ export class ApiService extends HttpService {
     }
 
     deleteArticle(id: number) {
-        return super.Service<boolean>({
+        return this.httpService.Service<boolean>({
             path: '/admin/article/del',
             method: 'DELETE',
             queryParam: {articleID: id}
@@ -50,7 +40,7 @@ export class ApiService extends HttpService {
     }
 
     articles(pageNumber: number = 1, pageSize: number = 5) {
-        return super.Service<PageList<Article>>({
+        return this.httpService.Service<PageList<Article>>({
             path: '/articles',
             method: 'GET',
             queryParam: {
@@ -61,7 +51,7 @@ export class ApiService extends HttpService {
     }
 
     adminArticles(pageNumber: number = 1, pageSize: number = 10) {
-        return super.Service<PageList<Article>>({
+        return this.httpService.Service<PageList<Article>>({
             path: '/admin/articles',
             method: 'GET',
             queryParam: {
@@ -72,7 +62,7 @@ export class ApiService extends HttpService {
     }
 
     updateArticle(article: ArticleReq) {
-        return super.Service<Article>({
+        return this.httpService.Service<Article>({
             path: '/admin/article/update',
             method: 'PUT',
             contentType: 'application/json',
@@ -81,7 +71,7 @@ export class ApiService extends HttpService {
     }
 
     getArticle(articleId: number, is4Update: boolean = false) {
-        return super.Service<Article>({
+        return this.httpService.Service<Article>({
             path: `/article/articleID/${articleId}`,
             method: 'GET',
             queryParam: {update: is4Update},
@@ -89,7 +79,7 @@ export class ApiService extends HttpService {
     }
 
     articlesByCategory(category: string, pageNumber: number = 1, pageSize: number = 10) {
-        return super.Service<PageList<Article>>({
+        return this.httpService.Service<PageList<Article>>({
             path: `/articles/category/${category}`,
             method: 'GET',
             queryParam: {
@@ -100,7 +90,7 @@ export class ApiService extends HttpService {
     }
 
     articlesByTag(tag: string, pageNumber: number = 1, pageSize: number = 10) {
-        return super.Service<PageList<Article>>({
+        return this.httpService.Service<PageList<Article>>({
             path: `/articles/tag/${tag}`,
             method: 'GET',
             queryParam: {
@@ -111,14 +101,14 @@ export class ApiService extends HttpService {
     }
 
     categories() {
-        return super.Service<PageList<Category>>({
+        return this.httpService.Service<PageList<Category>>({
             path: '/categories',
             method: 'GET'
         });
     }
 
     createCategory(nameStr: string) {
-        return super.Service<Category>({
+        return this.httpService.Service<Category>({
             path: '/admin/category/create',
             method: 'POST',
             queryParam: {name: nameStr}
@@ -126,7 +116,7 @@ export class ApiService extends HttpService {
     }
 
     deleteCategory(categoryId: number) {
-        return super.Service<boolean>({
+        return this.httpService.Service<boolean>({
             path: '/admin/category/del',
             method: 'DELETE',
             queryParam: {id: categoryId}
@@ -134,7 +124,7 @@ export class ApiService extends HttpService {
     }
 
     updateCategory(categoryId: number, nameStr: string) {
-        return super.Service<Category>({
+        return this.httpService.Service<Category>({
             path: '/admin/category/update',
             method: 'PUT',
             queryParam: {id: categoryId, name: nameStr}
@@ -142,7 +132,7 @@ export class ApiService extends HttpService {
     }
 
     tags(pageNumber: number = 1, pageSize: number = 10) {
-        return super.Service<PageList<Tag>>({
+        return this.httpService.Service<PageList<Tag>>({
             path: '/tags',
             method: 'GET',
             queryParam: {
@@ -153,14 +143,14 @@ export class ApiService extends HttpService {
     }
 
     tagsNac() {
-        return super.Service<{ name: string, size: number }[]>({
+        return this.httpService.Service<{ name: string, size: number }[]>({
             path: '/tags/nac',
             method: 'GET'
         });
     }
 
     createTag(nameStr: string) {
-        return super.Service<Tag>({
+        return this.httpService.Service<Tag>({
             path: '/admin/tag/create',
             method: 'POST',
             queryParam: {name: nameStr}
@@ -168,7 +158,7 @@ export class ApiService extends HttpService {
     }
 
     deleteTag(TagId: number) {
-        return super.Service<boolean>({
+        return this.httpService.Service<boolean>({
             path: '/admin/tag/del',
             method: 'DELETE',
             queryParam: {id: TagId}
@@ -176,7 +166,7 @@ export class ApiService extends HttpService {
     }
 
     updateTag(TagId: number, nameStr: string) {
-        return super.Service<Tag>({
+        return this.httpService.Service<Tag>({
             path: '/admin/tag/update',
             method: 'PUT',
             queryParam: {id: TagId, name: nameStr}
@@ -184,7 +174,7 @@ export class ApiService extends HttpService {
     }
 
     getCommentByTypeForAdmin(pagePath: string, pageNumber: number = 1, pageSize: number = 10) {
-        return super.Service<PageList<Comment>>({
+        return this.httpService.Service<PageList<Comment>>({
             path: `/admin/comment/pagePath/${pagePath}`,
             method: 'GET',
             queryParam: {
@@ -195,7 +185,7 @@ export class ApiService extends HttpService {
     }
 
     getCommentByTypeForUser(pagePath: string, pageNumber: number = 1, pageSize: number = 10) {
-        return super.Service<PageList<Comment>>({
+        return this.httpService.Service<PageList<Comment>>({
             path: `/user/comment/pagePath/${pagePath}`,
             method: 'GET',
             queryParam: {
@@ -206,7 +196,7 @@ export class ApiService extends HttpService {
     }
 
     deleteComment(idNumer: number) {
-        return super.Service<boolean>({
+        return this.httpService.Service<boolean>({
             path: `/user/comment/del`,
             method: 'DELETE',
             queryParam: {id: idNumer}
@@ -214,7 +204,7 @@ export class ApiService extends HttpService {
     }
 
     updateComment(commentReq: CommentReq) {
-        return super.Service<Comment>({
+        return this.httpService.Service<Comment>({
             path: `/user/comment/update`,
             method: 'PUT',
             data: commentReq,
@@ -223,7 +213,7 @@ export class ApiService extends HttpService {
     }
 
     comments(pagePath: string, pageSize: number = 10, pageNumber: number = 1) {
-        return super.Service<PageList<Comment>>({
+        return this.httpService.Service<PageList<Comment>>({
             path: `/comment/pagePath/${pagePath}`,
             method: 'GET',
             queryParam: {
@@ -234,7 +224,7 @@ export class ApiService extends HttpService {
     }
 
     createComment(commentReq: CommentReq) {
-        return super.Service<Comment>({
+        return this.httpService.Service<Comment>({
             path: '/user/comment/create',
             method: 'POST',
             contentType: 'application/json',
@@ -244,7 +234,7 @@ export class ApiService extends HttpService {
 
 
     counts() {
-        return super.Service<{
+        return this.httpService.Service<{
             articleCount: number,
             visitorCount: number,
             categoryCount: number,
@@ -257,7 +247,7 @@ export class ApiService extends HttpService {
     }
 
     adminLinks(pageSize: number = 10, pageNumber: number = 1) {
-        return super.Service<PageList<Link>>({
+        return this.httpService.Service<PageList<Link>>({
             path: '/admin/links',
             method: 'GET',
             queryParam: {
@@ -268,7 +258,7 @@ export class ApiService extends HttpService {
     }
 
     createLink(linkReq: Link) {
-        return super.Service<Link>({
+        return this.httpService.Service<Link>({
             path: '/admin/links/create',
             method: 'POST',
             data: linkReq,
@@ -277,14 +267,14 @@ export class ApiService extends HttpService {
     }
 
     deleteLink(idNumber: number) {
-        return super.Service<boolean>({
+        return this.httpService.Service<boolean>({
             path: `/admin/links/del/${idNumber}`,
             method: 'DELETE',
         });
     }
 
     updateLink(linkReq: Link) {
-        return super.Service<Link>({
+        return this.httpService.Service<Link>({
             path: '/admin/links/update',
             method: 'PUT',
             data: linkReq,
@@ -293,7 +283,7 @@ export class ApiService extends HttpService {
     }
 
     applyLink(link: ApplyLinkReq) {
-        return super.Service<string>({
+        return this.httpService.Service<string>({
             path: '/apply',
             method: 'POST',
             data: link,
@@ -302,7 +292,7 @@ export class ApiService extends HttpService {
     }
 
     reapplyLink(keyStr: string) {
-        return super.Service<string>({
+        return this.httpService.Service<string>({
             path: '/reapply',
             method: 'POST',
             queryParam: {
@@ -312,14 +302,14 @@ export class ApiService extends HttpService {
     }
 
     links() {
-        return super.Service<Link[]>({
+        return this.httpService.Service<Link[]>({
             path: '/links',
             method: 'GET',
         });
     }
 
     verifyImgCode(codeStr: string) {
-        return super.Service<string>({
+        return this.httpService.Service<string>({
             path: '/verCode',
             method: 'POST',
             queryParam: {code: codeStr}
@@ -328,7 +318,7 @@ export class ApiService extends HttpService {
 
 
     login(loginReq: LoginReq) {
-        return super.Service<User>({
+        return this.httpService.Service<User>({
             path: '/login',
             method: 'POST',
             contentType: 'application/json',
@@ -337,14 +327,14 @@ export class ApiService extends HttpService {
     }
 
     logout() {
-        return super.Service<string>({
+        return this.httpService.Service<string>({
             path: '/logout',
             method: 'GET',
         });
     }
 
     registration(emailStr: string, pwd: string) {
-        return super.Service<boolean>({
+        return this.httpService.Service<boolean>({
             path: '/registration',
             method: 'POST',
             queryParam: {
@@ -355,7 +345,7 @@ export class ApiService extends HttpService {
     }
 
     resetPwd(idStr: string, emailStr: string, pwdStr: string) {
-        return super.Service<string>({
+        return this.httpService.Service<string>({
             path: '/resetPwd',
             method: 'POST',
             queryParam: {
@@ -367,7 +357,7 @@ export class ApiService extends HttpService {
     }
 
     emailVerify(idStr: string, emailStr: string) {
-        return super.Service<void>({
+        return this.httpService.Service<void>({
             path: '/emailVerify',
             method: 'POST',
             queryParam: {
@@ -379,7 +369,7 @@ export class ApiService extends HttpService {
 
 
     sendResetPwdEmail(emailStr: string) {
-        return super.Service<string>({
+        return this.httpService.Service<string>({
             path: '/sendResetPwdEmail',
             method: 'POST',
             queryParam: {email: emailStr}
@@ -387,7 +377,7 @@ export class ApiService extends HttpService {
     }
 
     sendVerifyEmail(emailStr: string) {
-        return super.Service<string>({
+        return this.httpService.Service<string>({
             path: '/sendVerifyEmail',
             method: 'POST',
             queryParam: {email: emailStr}
@@ -395,14 +385,14 @@ export class ApiService extends HttpService {
     }
 
     userInfo() {
-        return super.Service<User>({
+        return this.httpService.Service<User>({
             path: '/user/userInfo',
             method: 'GET',
         });
     }
 
     adminUpdateUser(user: User) {
-        return super.Service<User>({
+        return this.httpService.Service<User>({
             path: '/admin/user',
             method: 'PUT',
             data: user,
@@ -411,14 +401,14 @@ export class ApiService extends HttpService {
     }
 
     deleteUser(id: number) {
-        return super.Service<boolean>({
+        return this.httpService.Service<boolean>({
             path: `/admin/user/delete/${id}`,
             method: 'DELETE',
         });
     }
 
     multipleDeleteUser(idArray: number[]) {
-        return super.Service<{ id: number; msg: string; status: boolean }[]>({
+        return this.httpService.Service<{ id: number; msg: string; status: boolean }[]>({
             path: `/admin/user/delete`,
             method: 'DELETE',
             data: idArray,
@@ -428,14 +418,14 @@ export class ApiService extends HttpService {
 
     // 获取邮件是否已注册
     emailStatus(email: string) {
-        return super.Service<boolean>({
+        return this.httpService.Service<boolean>({
             path: `/emailStatus/${email}`,
             method: 'GET'
         })
     }
 
     updateUserInfo(descStr: string, disPlayNameStr: string) {
-        return super.Service<User>({
+        return this.httpService.Service<User>({
             path: '/user/userInfo/update',
             method: 'PUT',
             queryParam: {
@@ -446,7 +436,7 @@ export class ApiService extends HttpService {
     }
 
     adminUsers(pageSize: number = 10, pageNumber: number = 1) {
-        return super.Service<PageList<User>>({
+        return this.httpService.Service<PageList<User>>({
             path: '/admin/users',
             method: 'GET',
             queryParam: {
@@ -457,14 +447,14 @@ export class ApiService extends HttpService {
     }
 
     visit() {
-        return super.Service<Visitor>({
+        return this.httpService.Service<Visitor>({
             path: '/visit',
             method: 'POST'
         });
     }
 
     adminVisitors(location: boolean = false, pageSize: number = 10, pageNumber: number = 1) {
-        return super.Service<PageList<Visitor>>({
+        return this.httpService.Service<PageList<Visitor>>({
             path: '/admin/visitor/page',
             method: 'GET',
             queryParam: {
@@ -476,42 +466,42 @@ export class ApiService extends HttpService {
     }
 
     dayVisitCount() {
-        return super.Service<number>({
+        return this.httpService.Service<number>({
             path: '/dayVisitCount',
             method: 'GET',
         });
     }
 
     getLocalIp() {
-        return super.Service<string>({
+        return this.httpService.Service<string>({
             path: '/ip',
             method: 'GET',
         });
     }
 
     getIpLocation(ip: string) {
-        return super.Service<string>({
+        return this.httpService.Service<string>({
             path: `/ip/${ip}`,
             method: 'GET',
         });
     }
 
     visitorCount() {
-        return super.Service<number>({
+        return this.httpService.Service<number>({
             path: `/visitor/count`,
             method: 'GET',
         });
     }
 
     webUpdate() {
-        return super.Service<{ id: number, info: string, time: string }[]>({
+        return this.httpService.Service<{ id: number, info: string, time: string }[]>({
             path: '/webUpdate',
             method: 'GET'
         });
     }
 
     webUpdatePage(pageSize: number = 10, pageNumber: number = 1) {
-        return super.Service<PageList<{ id: number, info: string, time: string }>>({
+        return this.httpService.Service<PageList<{ id: number, info: string, time: string }>>({
             path: '/webUpdate/pages',
             method: 'GET',
             queryParam: {
@@ -522,7 +512,7 @@ export class ApiService extends HttpService {
     }
 
     lastestUpdate() {
-        return super.Service<{
+        return this.httpService.Service<{
             lastUpdateTime: string;
             lastUpdateInfo: string;
             lastCommit: string;
@@ -536,7 +526,7 @@ export class ApiService extends HttpService {
     }
 
     createWebUpdateInfo(infoStr: string) {
-        return super.Service<UpdateInfo>({
+        return this.httpService.Service<UpdateInfo>({
             path: '/admin/webUpdate/create',
             method: 'POST',
             queryParam: {info: infoStr}
@@ -544,14 +534,14 @@ export class ApiService extends HttpService {
     }
 
     deleteWebUpdateInfo(idNumber: number) {
-        return super.Service<boolean>({
+        return this.httpService.Service<boolean>({
             path: `/admin/webUpdate/del/${idNumber}`,
             method: 'DELETE',
         });
     }
 
     updateWebUpdateInfo(idNumber: number, infoStr: string) {
-        return super.Service<UpdateInfo>({
+        return this.httpService.Service<UpdateInfo>({
             path: '/admin/webUpdate/update',
             method: 'PUT',
             queryParam: {id: idNumber, info: infoStr}
@@ -559,14 +549,14 @@ export class ApiService extends HttpService {
     }
 
     bingPic() {
-        return super.Service<string>({
+        return this.httpService.Service<string>({
             path: '/bingPic',
             method: 'GET'
         });
     }
 
     setPwd(pwdStr: string, newPwdStr: string, confirmPwdStr: string,) {
-        return super.Service<string>({
+        return this.httpService.Service<string>({
             path: '/user/setPwd',
             method: 'POST',
             queryParam: {
diff --git a/src/app/api/http/http.service.ts b/src/app/api/http/http.service.ts
index 7d3171c..9f38d52 100644
--- a/src/app/api/http/http.service.ts
+++ b/src/app/api/http/http.service.ts
@@ -1,28 +1,27 @@
-import {Injectable} from '@angular/core';
-import {RequestObj} from '../../class/HttpReqAndResp';
+import {Injectable, Injector} from '@angular/core';
+import {RequestObj, Response} from '../../class/HttpReqAndResp';
 import {HttpClient, HttpResponse} from '@angular/common/http';
 import {environment} from '../../../environments/environment';
 import {LocalStorageService} from '../../services/local-storage.service';
-import {Response} from '../../class/HttpReqAndResp';
-import {Observable, Observer, Subject} from 'rxjs';
-import {ErrDispatch} from '../../class/ErrDispatch';
+import {Observable, Observer, Subscription} from 'rxjs';
+import {ErrorService} from '../../services/error.service';
 
 @Injectable({
-    providedIn: 'root'
+    providedIn: 'root',
 })
 export class HttpService {
 
     constructor(private httpClient: HttpClient,
-                protected localStorageService: LocalStorageService) {
+                private localStorageService: LocalStorageService,
+                private injector: Injector) {
     }
 
-    private errorDispatch: ErrDispatch;
+    private subscriptionQueue: Subscription[] = [];
 
-    setErrDispatch(errDispatch: ErrDispatch) {
-        this.errorDispatch = errDispatch;
-    }
+    public getSubscriptionQueue = () => this.subscriptionQueue;
 
     Service<T>(request: RequestObj) {
+        const errorService = this.injector.get(ErrorService);
         request.url = null;
         // 设置默认值
         request.contentType = request.contentType == null ? 'application/x-www-form-urlencoded' : request.contentType;
@@ -55,25 +54,32 @@ export class HttpService {
 
         const oob = new Observable<Response<T>>(o => observer = o);
 
-        observable.subscribe(o => {
-            const tokenFromReps = o.headers.get('Authorization');
-            if (tokenFromReps) {
-                this.localStorageService.setToken(tokenFromReps);
-            }
-            if (o.body.code !== 0) {
-                observer.error(o.body);
-                if (this.errorDispatch) {
-                    this.errorDispatch.errHandler(o.body.code, o.body.msg, request);
+        const subscription = observable.subscribe({
+            next: o => {
+                const tokenFromReps = o.headers.get('Authorization');
+                if (tokenFromReps) {
+                    this.localStorageService.setToken(tokenFromReps);
                 }
-            } else {
-                observer.next(o.body);
-            }
-            observer.complete();
+                if (o.body.code !== 0) {
+                    observer.error(o.body);
+                    errorService.httpException(o.body)
+                } else {
+                    observer.next(o.body);
+                }
+                observer.complete();
+            },
+            error: err => {
+                errorService.httpError(err);
+                errorService.checkConnection();
+                this.subscriptionQueue.splice(this.subscriptionQueue.indexOf(subscription), 1)
+            },
+            complete: () => this.subscriptionQueue.splice(this.subscriptionQueue.indexOf(subscription), 1)
         });
+        this.subscriptionQueue.push(subscription);
         return oob;
     }
 
-    private get<T>(request: RequestObj) {
+    get<T>(request: RequestObj) {
         return this.httpClient.get<T>(request.url,
             {
                 headers: request.header,
@@ -82,7 +88,7 @@ export class HttpService {
             });
     }
 
-    private post<T>(request: RequestObj) {
+    post<T>(request: RequestObj) {
         return this.httpClient.post<T>(request.url, request.data,
             {
                 headers: request.header,
@@ -91,7 +97,7 @@ export class HttpService {
             });
     }
 
-    private put<T>(request: RequestObj) {
+    put<T>(request: RequestObj) {
         return this.httpClient.put<T>(request.url, request.data,
             {
                 headers: request.header,
@@ -100,7 +106,7 @@ export class HttpService {
             });
     }
 
-    private delete<T>(request: RequestObj) {
+    delete<T>(request: RequestObj) {
         return this.httpClient.delete<T>(request.url,
             {
                 headers: request.header,
diff --git a/src/app/app-routing.module.ts b/src/app/app-routing.module.ts
index 76d430f..93fb679 100644
--- a/src/app/app-routing.module.ts
+++ b/src/app/app-routing.module.ts
@@ -11,17 +11,15 @@ const routes: Routes = [
     {path: 'resetPwd', loadChildren: () => import('./view/reset-pwd/reset-pwd.module').then(mod => mod.ResetPwdModule)},
     {path: 'write', loadChildren: () => import('./view/write/write.module').then(mod => mod.WriteModule)},
     {path: 'links', loadChildren: () => import('./view/link/link.module').then(mod => mod.LinkModule)},
+    {path: 'admin', loadChildren: () => import('./view/admin/admin.module').then(mod => mod.AdminModule)},
+    {path: 'maintain', loadChildren: () => import('./view/maintain/maintain.module').then(mod => mod.MaintainModule)},
     {
         path: 'emailVerify',
         loadChildren: () => import('./view/email-verify/email-verify.module').then(mod => mod.EmailVerifyModule)
     },
     {
-        path: 'user', loadChildren: () => import('./view/login-registration/login-registration.module')
-            .then(mod => mod.LoginRegistrationModule)
-    },
-    {
-        path: 'admin',
-        loadChildren: () => import('./view/admin/admin.module').then(mod => mod.AdminModule),
+        path: 'user',
+        loadChildren: () => import('./view/login-registration/login-registration.module').then(mod => mod.LoginRegistrationModule)
     },
     {
         path: '**',
diff --git a/src/app/app.module.ts b/src/app/app.module.ts
index 0e762e0..ae58dc1 100644
--- a/src/app/app.module.ts
+++ b/src/app/app.module.ts
@@ -1,5 +1,5 @@
 import {BrowserModule} from '@angular/platform-browser';
-import {NgModule} from '@angular/core';
+import {forwardRef, NgModule} from '@angular/core';
 import {AppComponent} from './app.component';
 import {NgZorroAntdModule, NZ_I18N, zh_CN} from 'ng-zorro-antd';
 import {FormsModule} from '@angular/forms';
@@ -12,8 +12,14 @@ import {FooterComponent} from './components/footer/footer.component';
 import {AppRoutingModule} from './app-routing.module';
 import {LoginRegistrationModule} from './view/login-registration/login-registration.module';
 import {AdminModule} from './view/admin/admin.module';
-import { ServiceWorkerModule } from '@angular/service-worker';
-import { environment } from '../environments/environment';
+import {ServiceWorkerModule} from '@angular/service-worker';
+import {environment} from '../environments/environment';
+import {HttpService} from './api/http/http.service';
+import {ErrorService} from './services/error.service';
+import {ComponentStateService} from './services/component-state.service';
+import {GlobalUserService} from './services/global-user.service';
+import {LocalStorageService} from './services/local-storage.service';
+import {ApiService} from './api/api.service';
 
 
 registerLocaleData(zh);
@@ -33,9 +39,17 @@ registerLocaleData(zh);
         BrowserAnimationsModule,
         LoginRegistrationModule,
         AdminModule,
-        ServiceWorkerModule.register('ngsw-worker.js', { enabled: environment.production })
+        ServiceWorkerModule.register('ngsw-worker.js', {enabled: environment.production})
+    ],
+    providers: [
+        ComponentStateService,
+        GlobalUserService,
+        LocalStorageService,
+        HttpService,
+        ApiService,
+        ErrorService,
+        {provide: NZ_I18N, useValue: zh_CN},
     ],
-    providers: [{provide: NZ_I18N, useValue: zh_CN}],
     exports: [],
     bootstrap: [AppComponent]
 })
diff --git a/src/app/class/ErrDispatch.ts b/src/app/class/ErrDispatch.ts
deleted file mode 100644
index 79c04fa..0000000
--- a/src/app/class/ErrDispatch.ts
+++ /dev/null
@@ -1,5 +0,0 @@
-import {RequestObj} from './HttpReqAndResp';
-
-export interface ErrDispatch {
-    errHandler(code: number, msg: string, request?: RequestObj): void;
-}
diff --git a/src/app/components/header/header.component.ts b/src/app/components/header/header.component.ts
index 1da6ca0..34de1e8 100644
--- a/src/app/components/header/header.component.ts
+++ b/src/app/components/header/header.component.ts
@@ -37,7 +37,8 @@ export class HeaderComponent implements OnInit {
         });
         // 订阅一级路由的变化
         componentStateService.watchRouterChange().subscribe(prefix => {
-            if (prefix === '/user' || prefix === '/write' || prefix === '/update') {
+            // TODO:: 使用service来获取 size
+            if (prefix === '/user' || prefix === '/write' || prefix === '/update' || prefix === '/maintain') {
                 this.size = 'default';
             } else {
                 this.size = 'large';
diff --git a/src/app/services/error.service.ts b/src/app/services/error.service.ts
new file mode 100644
index 0000000..748fee3
--- /dev/null
+++ b/src/app/services/error.service.ts
@@ -0,0 +1,59 @@
+import {Injectable} from '@angular/core';
+import {RequestObj, Response} from '../class/HttpReqAndResp';
+import {HttpService} from '../api/http/http.service';
+import {environment} from '../../environments/environment';
+import {Router} from '@angular/router';
+import {ComponentStateService} from './component-state.service';
+import {NzNotificationService} from 'ng-zorro-antd';
+
+@Injectable({
+    providedIn: 'root'
+})
+export class ErrorService {
+
+    constructor(private httpService: HttpService, private router: Router,
+                private componentStateService: ComponentStateService,
+                private notification: NzNotificationService) {
+    }
+
+    private static HTTP_ERROR_COUNT: number = 0;
+    private readonly MAINTAIN_PAGE_PREFIX = '/maintain'
+    private readonly ADMIN_PAGE_PREFIX = '/admin'
+
+    public httpError(err: any) {
+        if (!environment.production) {
+            console.log('error=>', err)
+        }
+        ErrorService.HTTP_ERROR_COUNT++;
+        // this.httpService.getSubscriptionQueue().map(a => a.unsubscribe())
+    }
+
+    public httpException(response: Response<any>) {
+        if (!environment.production)
+            console.log('exception=>', response)
+        if (response.code === -1 && response.msg === '重复请求') return
+        if (this.componentStateService.currentPath === this.ADMIN_PAGE_PREFIX) {
+            this.notification.create('error', `请求失败<${response.code}>`, `${response.msg}`);
+        }
+    }
+
+    public checkConnection() {
+        // The HTTP_ERROR_COUNT is start with 1 in this function
+        if (ErrorService.HTTP_ERROR_COUNT === 1) {
+            const req: RequestObj = {
+                path: '/headerInfo',
+                method: 'GET',
+                url: environment.host + '/headerInfo'
+            }
+            this.httpService.get(req).subscribe({
+                next: () => null,
+                error: () => {
+                    if (this.componentStateService.currentPath !== this.MAINTAIN_PAGE_PREFIX) {
+                        this.router.navigateByUrl(this.MAINTAIN_PAGE_PREFIX)
+                    }
+                    ErrorService.HTTP_ERROR_COUNT = 0;
+                }
+            })
+        }
+    }
+}
diff --git a/src/app/view/admin/admin-link/admin-link.component.html b/src/app/view/admin/admin-link/admin-link.component.html
index 664abab..7d68b1c 100644
--- a/src/app/view/admin/admin-link/admin-link.component.html
+++ b/src/app/view/admin/admin-link/admin-link.component.html
@@ -4,6 +4,7 @@
               [headData]="headData"
               [template]="{open:{temp:open,param:{true:'可见',false:'不可见'}},delete:{temp:deleteTemp,param:{true:'已删除',false:'未删除'}}}"
 >
+    <button nz-button (click)="addLink()">添加</button>
 </common-table>
 
 <ng-template #open let-value="value">
diff --git a/src/app/view/admin/admin-link/admin-link.module.ts b/src/app/view/admin/admin-link/admin-link.module.ts
index 5c78133..954d661 100644
--- a/src/app/view/admin/admin-link/admin-link.module.ts
+++ b/src/app/view/admin/admin-link/admin-link.module.ts
@@ -3,7 +3,15 @@ import {CommonModule} from '@angular/common';
 import {RouterModule} from '@angular/router';
 import {AdminLinkComponent} from './admin-link.component';
 import {CommonTableModule} from '../components/common-table/common-table.module';
-import {NzCheckboxModule, NzFormModule, NzInputModule, NzModalModule, NzSelectModule, NzTagModule} from 'ng-zorro-antd';
+import {
+    NzButtonModule,
+    NzCheckboxModule,
+    NzFormModule,
+    NzInputModule,
+    NzModalModule,
+    NzSelectModule,
+    NzTagModule
+} from 'ng-zorro-antd';
 import {FormsModule, ReactiveFormsModule} from '@angular/forms';
 
 
@@ -23,6 +31,7 @@ import {FormsModule, ReactiveFormsModule} from '@angular/forms';
         NzInputModule,
         NzSelectModule,
         NzTagModule,
+        NzButtonModule,
 
     ]
 })
diff --git a/src/app/view/index/index.component.ts b/src/app/view/index/index.component.ts
index 0c8b905..5d543a2 100644
--- a/src/app/view/index/index.component.ts
+++ b/src/app/view/index/index.component.ts
@@ -3,11 +3,9 @@ import {ApiService} from '../../api/api.service';
 import {Article} from '../../class/Article';
 import {NzIconService, NzMessageService} from 'ng-zorro-antd';
 import {SvgIconUtil} from '../../utils/svgIconUtil';
-import {PageList} from '../../class/HttpReqAndResp';
-import {ErrDispatch} from '../../class/ErrDispatch';
-import {RequestObj} from '../../class/HttpReqAndResp';
+import {PageList, RequestObj} from '../../class/HttpReqAndResp';
 import {Router} from '@angular/router';
-import {Category, Tag} from '../../class/Tag';
+import {Category} from '../../class/Tag';
 import {Title} from '@angular/platform-browser';
 
 @Component({
@@ -16,7 +14,7 @@ import {Title} from '@angular/platform-browser';
     styleUrls: ['./index.component.less'],
     providers: [ApiService]
 })
-export class IndexComponent implements OnInit, ErrDispatch {
+export class IndexComponent implements OnInit {
 
     constructor(private apiService: ApiService,
                 private iconService: NzIconService,
@@ -24,7 +22,6 @@ export class IndexComponent implements OnInit, ErrDispatch {
                 private router: Router,
                 private title: Title) {
         this.iconService.addIconLiteral('blog:location', SvgIconUtil.locationIcon);
-        apiService.setErrDispatch(this);
         title.setTitle('小海博客');
     }
 
diff --git a/src/app/view/login-registration/components/registration/registration.component.ts b/src/app/view/login-registration/components/registration/registration.component.ts
index c4788a7..2e1439c 100644
--- a/src/app/view/login-registration/components/registration/registration.component.ts
+++ b/src/app/view/login-registration/components/registration/registration.component.ts
@@ -3,7 +3,6 @@ import {environment} from '../../../../../environments/environment';
 import {ApiService} from '../../../../api/api.service';
 import {NzMessageService} from 'ng-zorro-antd';
 import {Router} from '@angular/router';
-import {ErrDispatch} from '../../../../class/ErrDispatch';
 import {RequestObj} from '../../../../class/HttpReqAndResp';
 import {LoginReq} from '../../../../class/User';
 import {Title} from '@angular/platform-browser';
@@ -14,13 +13,12 @@ import {Title} from '@angular/platform-browser';
     styleUrls: ['./registration.component.less'],
     providers: [ApiService]
 })
-export class RegistrationComponent implements OnInit, ErrDispatch {
+export class RegistrationComponent implements OnInit {
 
     constructor(private apiService: ApiService,
                 private  nzMessageService: NzMessageService,
                 private router: Router,
                 private title: Title) {
-        apiService.setErrDispatch(this);
         this.title.setTitle('小海博客 | 注册');
     }
 
diff --git a/src/app/view/maintain/maintain.component.html b/src/app/view/maintain/maintain.component.html
new file mode 100644
index 0000000..3d73c89
--- /dev/null
+++ b/src/app/view/maintain/maintain.component.html
@@ -0,0 +1,5 @@
+<nz-result nzStatus="500" nzTitle="暂时无法连接到后台服务器,可能正在维护更新">
+    <div nz-result-extra>
+        <button nz-button nzType="primary" routerLink="/">返回首页</button>
+    </div>
+</nz-result>
diff --git a/src/app/view/maintain/maintain.component.less b/src/app/view/maintain/maintain.component.less
new file mode 100644
index 0000000..e69de29
diff --git a/src/app/view/maintain/maintain.component.ts b/src/app/view/maintain/maintain.component.ts
new file mode 100644
index 0000000..fbe4099
--- /dev/null
+++ b/src/app/view/maintain/maintain.component.ts
@@ -0,0 +1,16 @@
+import {Component, OnInit} from '@angular/core';
+
+@Component({
+    selector: 'app-maintain',
+    templateUrl: './maintain.component.html',
+    styleUrls: ['./maintain.component.less']
+})
+export class MaintainComponent implements OnInit {
+
+    constructor() {
+    }
+
+    ngOnInit(): void {
+    }
+
+}
diff --git a/src/app/view/maintain/maintain.module.ts b/src/app/view/maintain/maintain.module.ts
new file mode 100644
index 0000000..ee5388a
--- /dev/null
+++ b/src/app/view/maintain/maintain.module.ts
@@ -0,0 +1,18 @@
+import {NgModule} from '@angular/core';
+import {CommonModule} from '@angular/common';
+import {MaintainComponent} from './maintain.component';
+import {RouterModule} from '@angular/router';
+import {NzButtonModule, NzResultModule} from 'ng-zorro-antd';
+
+
+@NgModule({
+    declarations: [MaintainComponent],
+    imports: [
+        CommonModule,
+        RouterModule.forChild([{path: '', component: MaintainComponent}]),
+        NzResultModule,
+        NzButtonModule
+    ]
+})
+export class MaintainModule {
+}