feat 完善注释

src/directives/index.ts

@@ -3,7 +3,6 @@ import lazy from './lazy'
 import debounce from './debounce'
 import throttle from './throttle'
 
-/** main.ts 调用：统一注册自定义指令 */
 export function setupDirectives(app: App): void {
   app
     .directive('lazy', lazy)