fix

src/app/services/api/user.service.spec.ts

@@ -0,0 +1,12 @@
+import { TestBed } from '@angular/core/testing';
+
+import { UserService } from './user.service';
+
+describe('UserService', () => {
+  beforeEach(() => TestBed.configureTestingModule({}));
+
+  it('should be created', () => {
+    const service: UserService = TestBed.get(UserService);
+    expect(service).toBeTruthy();
+  });
+});

src/app/services/api/user.service.ts

@@ -0,0 +1,15 @@
+import { Injectable } from '@angular/core';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class UserService {
+
+  constructor() { }
+
+  connectUser(){
+    alert('1202020');
+
+  }
+
+}

src/app/tab1/tab1.page.ts

@@ -1,4 +1,6 @@
 import { Component , ViewChild} from '@angular/core';
+import { UserService } from '../services/api/user.service';
+
 
 @Component({
   selector: 'app-tab1',
@@ -9,8 +11,11 @@ export class Tab1Page {
 
 @ViewChild('jubapage') jubapage:any;
 
+constructor (public UserS :UserService){
+
+}
   goConnect(){
-    alert(this.jubapage);
+    this.UserS.connectUser();
   }
 
 }