1. Because of the need of the project, we need a video playback function. After Baidu, many people recommend using videogular2, but report errors when using it
. paste my code: 
 training-start.Module.ts code: 
 import {NgModule} from"@ angular/core"; 
 import {IonicPageModule} from "ionic-angular"; 
 import {TrainingStartPage} from". / training-start"; 
 import {VgCoreModule} from "videogular2/core"; 
 import {VgControlsModule} from" videogular2/controls"; 
 import {VgOverlayPlayModule} from "videogular2/overlay-play"; 
 import {VgBufferingModule} from" videogular2/buffering"; 
 @ NgModule ({
 declarations: [
TrainingStartPage,
], 
 imports: [
VgCoreModule,
VgControlsModule,
VgOverlayPlayModule,
VgBufferingModule,
IonicPageModule.forChild(TrainingStartPage),
], 
}) 
 export class TrainingStartPageModule {
} 
Code in html:
< ion-header >
< ion-navbar >
<ion-title></ion-title>
< / ion-navbar >
< / ion-header >
 < ion-content padding > 
 < vg-player > 
<video [vgMedia]="media" -sharpmedia id="singleVideo" preload="auto" controls>
  <source src="http://static.videogular.com/assets/videos/videogular.mp4" type="video/mp4">
</video>
 < / vg-player > 
 < / ion-content > 
error report:
 
 
