From 8d355c178c7e181feaef5c906457c96e6eafee7e Mon Sep 17 00:00:00 2001
From: swx1239486 <songqinqin4@huawei.com>
Date: Tue, 5 Sep 2023 20:43:17 +0800
Subject: [PATCH] =?UTF-8?q?=E4=B8=80=E5=A4=9Aakrts=E9=A2=84=E8=AD=A6?=
 =?UTF-8?q?=E6=95=B4=E6=94=B9?=
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Signed-off-by: swx1239486 <songqinqin4@huawei.com>
---
 .../multi-device-app-dev/responsive-layout.md    | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/zh-cn/application-dev/key-features/multi-device-app-dev/responsive-layout.md b/zh-cn/application-dev/key-features/multi-device-app-dev/responsive-layout.md
index 6da55b1e78..ce5f47f69e 100644
--- a/zh-cn/application-dev/key-features/multi-device-app-dev/responsive-layout.md
+++ b/zh-cn/application-dev/key-features/multi-device-app-dev/responsive-layout.md
@@ -52,16 +52,16 @@
 
    ```ts
    // MainAbility.ts
-   import type window from '@ohos.window'
+   import window from '@ohos.window'
    import display from '@ohos.display'
    import Ability from '@ohos.app.ability.Ability'
    
    export default class MainAbility extends Ability {
-     private windowObj: window.Window
-     private curBp: string
+     private windowObj?: window.Window
+     private curBp: string = ''
      //...
      // 根据当前窗口尺寸更新断点
-     private updateBreakpoint(windowWidth) :void{
+     private updateBreakpoint(windowWidth: number) :void{
        // 将长度的单位由px换算为vp
        let windowWidthVp = windowWidth / (display.getDefaultDisplaySync().densityDPI / 160)
        let newBp: string = ''
@@ -166,7 +166,7 @@ export class BreakpointType<T> {
     this.md = md
     this.lg = lg
   }
-  GetValue(currentBreakpoint: string):T {
+  GetValue(currentBreakpoint: string):T | undefined{
     if (currentBreakpoint === 'sm') {
       return this.sm
     }
@@ -182,9 +182,9 @@ export class BreakpointType<T> {
 
 export class BreakpointSystem {
   private currentBreakpoint: string = 'md'
-  private smListener: mediaquery.MediaQueryListener
-  private mdListener: mediaquery.MediaQueryListener
-  private lgListener: mediaquery.MediaQueryListener
+  private smListener?: mediaquery.MediaQueryListener
+  private mdListener?: mediaquery.MediaQueryListener
+  private lgListener?: mediaquery.MediaQueryListener
 
   private updateCurrentBreakpoint(breakpoint: string) :void{
     if (this.currentBreakpoint !== breakpoint) {
-- 
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