如果你的组件在同一个目录中，那么你也需要将你的 templateUrl 指向同一个文件夹.您可以这样做:

If your component is inside the same directory, then you need to point your templateUrl to the same folder as well. Here is how you can do it:

@Component({
    selector: 'app-sb',
    templateUrl: './sb.component.html'
})