添加了一个pipe打印处理完handler的耗时

src/core/interceptors/logging.interceptor.ts

@@ -1,11 +1,21 @@
 import { CallHandler, ExecutionContext, Injectable, NestInterceptor } from '@nestjs/common';
 import { Observable } from 'rxjs';
+import { tap } from 'rxjs/operators'
 
 @Injectable()
 export class LoggingInterceptor implements NestInterceptor {
   intercept(context: ExecutionContext, next: CallHandler): Observable<any> {
     console.log('I am a interceptor!')
+
+    const now = Date.now();
+    console.log('before...');
+
+
     
-    return next.handle();
+    return next
+    .handle()
+    .pipe(
+      tap(() => console.log(`after... ${Date.now() - now}ms`))
+    );
   }
 }