doc文档示例代码整改

Signed-off-by: Nzhengjiangliang <zhengjiangliang@huawei.com>
Change-Id: Iaee7d59296d2f037bc50a9c010c74bf3696dbc23

zh-cn/application-dev/reference/apis/js-apis-display.md

@@ -84,16 +84,17 @@ getDefaultDisplaySync(): Display
 
 | 错误码ID | 错误信息 |
 | ------- | ----------------------- |
-| 1400001 | This is invalid screen. |
+| 1400001 | Invalid display or screen. |
 
 **示例：**
 
 ```js
+let displayClass = null;
 try {
-    let displayClass = display.getDefaultDisplaySync();
+    displayClass = display.getDefaultDisplaySync();
 } catch (exception) {
     console.error('Failed to obtain the default display object. Code: ' + JSON.stringify(exception));
-};
+}
 ```
 
 ## display.getAllDisplays<sup>9+</sup>
@@ -116,7 +117,7 @@ getAllDisplays(callback: AsyncCallback&lt;Array&lt;Display&gt;&gt;): void
 
 | 错误码ID | 错误信息 |
 | ------- | ----------------------- |
-| 1400001 | This is invalid screen. |
+| 1400001 | Invalid display or screen. |
 
 **示例：**
 
@@ -152,7 +153,7 @@ getAllDisplays(): Promise&lt;Array&lt;Display&gt;&gt;
 
 | 错误码ID | 错误信息 |
 | ------- | ----------------------- |
-| 1400001 | This is invalid screen. |
+| 1400001 | Invalid display or screen. |
 
 **示例：**
 
@@ -195,7 +196,7 @@ hasPrivateWindow(displayId: number): boolean
 
 | 错误码ID | 错误信息 |
 | ------- | -------------------------------------------- |
-| 1400003 | This window manager service work abnormally. |
+| 1400003 | This display manager service works abnormally. |
 
 **示例：**
 
@@ -203,24 +204,24 @@ hasPrivateWindow(displayId: number): boolean
 let displayClass = null;
 try {
     displayClass = display.getDefaultDisplaySync();
-} catch (exception) {
-    console.error('Failed to obtain the default display object. Code: ' + JSON.stringify(exception));
-    return;
-};
 
-try {
-    let ret = display.hasPrivateWindow(displayClass.id);
+    let ret = undefined;
+    try {
+        ret = display.hasPrivateWindow(displayClass.id);
+    } catch (exception) {
+        console.error('Failed to check has privateWindow or not. Code: ' + JSON.stringify(exception));
+    }
+    if (ret == undefined) {
+        console.log("Failed to check has privateWindow or not.");
+    }
+    if (ret) {
+        console.log("There has privateWindow.");
+    } else if (!ret) {
+        console.log("There has no privateWindow.");
+    }
 } catch (exception) {
-    console.error('Failed to check has privateWindow or not. Code: ' + JSON.stringify(exception));
-};
-if (ret == undefined) {
-  console.log("Failed to check has privateWindow or not.");
+    console.error('Failed to obtain the default display object. Code: ' + JSON.stringify(exception));
 }
-if (ret) {
-  console.log("There has privateWindow.");
-} else if (!ret) {
-  console.log("There has no privateWindow.");
-};
 ```
 
 ## display.on('add'|'remove'|'change')
@@ -243,12 +244,12 @@ on(type: 'add'|'remove'|'change', callback: Callback&lt;number&gt;): void
 ```js
 let callback = (data) => {
     console.info('Listening enabled. Data: ' + JSON.stringify(data));
-}
+};
 try {
     display.on("add", callback);
 } catch (exception) {
     console.error('Failed to register callback. Code: ' + JSON.stringify(exception));
-};
+}
 ```
 
 ## display.off('add'|'remove'|'change')
@@ -273,7 +274,7 @@ try {
     display.off("remove");
 } catch (exception) {
     console.error('Failed to unregister callback. Code: ' + JSON.stringify(exception));
-};
+}
 ```
 
 ## display.getDefaultDisplay<sup>(deprecated)</sup>
@@ -412,7 +413,7 @@ promise.then((data) => {
 | alive | boolean | 是 | 否 | 显示设备是否启用。|
 | state | [DisplayState](#displaystate) | 是 | 否 | 显示设备的状态。|
 | refreshRate | number | 是 | 否 | 显示设备的刷新率。|
-| rotation | number | 是 | 否 | 显示设备的屏幕旋转角度。|
+| rotation | number | 是 | 否 | 显示设备的屏幕旋转角度。<br>值为0时，表示显示设备屏幕旋转为0°；<br>值为1时，表示显示设备屏幕旋转为90°；<br>值为2时，表示显示设备屏幕旋转为180°；<br>值为3时，表示显示设备屏幕旋转为270°。|
 | width | number | 是 | 否 | 显示设备的宽度，单位为像素。|
 | height | number | 是 | 否 | 显示设备的高度，单位为像素。|
 | densityDPI | number | 是 | 否 | 显示设备的屏幕密度，单位为DPI。|
@@ -440,24 +441,25 @@ getCutoutInfo(callback: AsyncCallback&lt;CutoutInfo&gt;): void
 
 | 错误码ID | 错误信息 |
 | ------- | ----------------------- |
-| 1400001 | This is invalid screen. |
+| 1400001 | Invalid display or screen. |
 
 **示例：**
 
 ```js
+let displayClass = null;
 try {
-    let displayClass = display.getDefaultDisplaySync();
+    displayClass = display.getDefaultDisplaySync();
+
+    displayClass.getCutoutInfo((err, data) => {
+        if (err.code) {
+            console.error('Failed to get cutoutInfo. Code: ' + JSON.stringify(err));
+            return;
+        }
+        console.info('Succeeded in getting cutoutInfo. data: ' + JSON.stringify(data));
+    });
 } catch (exception) {
     console.error('Failed to obtain the default display object. Code: ' + JSON.stringify(exception));
-};
-
-displayClass.getCutoutInfo((err, data) => {
-    if (err.code) {
-        console.error('Failed to get cutoutInfo. Code: ' + JSON.stringify(err));
-        return;
-    }
-    console.info('Succeeded in getting cutoutInfo. data: ' + JSON.stringify(data));
-});
+}
 ```
 ### getCutoutInfo<sup>9+</sup>
 getCutoutInfo(): Promise&lt;CutoutInfo&gt;
@@ -478,19 +480,22 @@ getCutoutInfo(): Promise&lt;CutoutInfo&gt;
 
 | 错误码ID | 错误信息 |
 | ------- | ----------------------- |
-| 1400001 | This is invalid screen. |
+| 1400001 | Invalid display or screen. |
 
 **示例：**
 
 ```js
+let displayClass = null;
 try {
-    let displayClass = display.getDefaultDisplaySync();
+    displayClass = display.getDefaultDisplaySync();
+
+    let promise = displayClass.getCutoutInfo();
+    promise.then((data) => {
+        console.info('Succeeded in getting cutoutInfo. Data: ' + JSON.stringify(data));
+    }).catch((err) => {
+        console.error('Failed to obtain all the display objects. Code: ' + JSON.stringify(err));
+    });
 } catch (exception) {
     console.error('Failed to obtain the default display object. Code: ' + JSON.stringify(exception));
-};
-
-let promise = displayClass.getCutoutInfo();
-promise.then((data) => {
-    console.info('Succeeded in getting cutoutInfo. Data: ' + JSON.stringify(data));
-});
+}
 ```