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Angular的ngRunGuards方法可以用来防止在变更检测期间执行不必要的守卫。具体步骤如下:
import { CanActivateChild, ActivatedRouteSnapshot, RouterStateSnapshot } from '@angular/router';
export class MyGuard implements CanActivateChild {
canActivateChild(
route: ActivatedRouteSnapshot,
state: RouterStateSnapshot
): boolean {
// Add logic here to determine if guard should run
if (condition) {
return true;
} else {
return false;
}
}
}
const routes: Routes = [
{
path: 'protected',
component: ProtectedComponent,
canActivateChild: [MyGuard]
}
];
@NgModule({
imports: [RouterModule.forRoot(routes)],
exports: [RouterModule]
})
export class AppRoutingModule {
ngRunGuards(transition: Transition, currentSnapshot: ActivatedRouteSnapshot): void {
if (transition._targetState && transition._targetState._routeConfig && transition._targetState._routeConfig.canActivateChild) {
const canActivateChildGuards = transition._targetState._routeConfig.canActivateChild;
canActivateChildGuards.forEach((guard: any) => {
const result = guard.canActivateChild(transition._targetState._root, currentSnapshot);
if (!result) {
transition.abort();
}
});
}
}
}
通过以上步骤,您可以使用Angular的ngRunGuards方法来防止在变更检测期间执行不必要的守卫。
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