在desktop.module.ts中，您需要导出RouterModule

in desktop.module.ts you need to exports the RouterModule

@NgModule({
    imports: [
        CommonModule,
        IonicModule,
        RouterModule.forChild(routes)
    ],
    declarations: [WorkoutComponent, DesktopComponent],
    exports: [RouterModule]
})

，您应该像这样进行导航(尝试使用您的方式，如果仍然无法运行，请尝试以下操作):

and you should navigate like this (try ur way, if still not working try this):

[routerLink]="['/d/workout']"
routerLink="/d/workout"