Update docs (18377)

Signed-off-by: Nester.zhou <ester.zhou@huawei.com>

en/application-dev/reference/apis/js-apis-webview.md

@@ -739,6 +739,11 @@ Loads specified data.
 | baseUrl    | string | No  | URL (HTTP/HTTPS/data compliant), which is assigned by the **\<Web>** component to **window.origin**.|
 | historyUrl | string | No  | URL used for historical records. If this parameter is not empty, historical records are managed based on this URL. This parameter is invalid when **baseUrl** is left empty.|
 
+> **NOTE**
+> 
+> To load a local image, you can assign a space to either **baseUrl** or **historyUrl**. For details, see the sample code.
+> In the scenario of loading a local image, **baseUrl** and **historyUrl** cannot be both empty. Otherwise, the image cannot be loaded.
+
 **Error codes**
 
 For details about the error codes, see [Webview Error Codes](../errorcodes/errorcode-webview.md).
@@ -1754,7 +1759,7 @@ Zooms in or out of this web page.
 
 | Name| Type| Mandatory| Description|
 | ------ | -------- | ---- | ------------------------------------------------------------ |
-| factor | number   | Yes  | Relative zoom ratio. A positive value indicates zoom-in, and a negative value indicates zoom-out.|
+| factor | number   | Yes  | Relative zoom ratio. The value must be greater than 0. The value **1** indicates that the page is not zoomed. A value smaller than **1** indicates zoom-out, and a value greater than **1** indicates zoom-in.|
 
 **Error codes**
 
@@ -2037,7 +2042,7 @@ Creates web message ports. For the complete sample code, see [onMessageEventExt]
 
 | Name| Type                  | Mandatory| Description                            |
 | ------ | ---------------------- | ---- | :------------------------------|
-| isExtentionType<sup>10+</sup>   | boolean     | No | Whether to use the extended interface. The default value is **false**, indicating that the extended interface is not used.|
+| isExtentionType<sup>10+</sup>   | boolean     | No | Whether to use the extended interface. The default value is **false**, indicating that the extended interface is not used. This parameter is supported since API version 10.|
 
 **Return value**
 
@@ -2523,6 +2528,37 @@ struct WebComponent {
 }
 ```
 
+You can customize the user agent based on the default user agent.
+```ts
+// xxx.ets
+import web_webview from '@ohos.web.webview';
+
+@Entry
+@Component
+struct WebComponent {
+  controller: web_webview.WebviewController = new web_webview.WebviewController();
+  @State ua: string = ""
+
+  aboutToAppear():void {
+    web_webview.once('webInited', () => {
+      try {
+        // Customize the user agent on the application side.
+        this.ua = this.controller.getUserAgent() + 'xxx';
+      } catch(error) {
+        console.error(`ErrorCode: ${error.code},  Message: ${error.message}`);
+      }
+    })
+  }
+
+  build() {
+    Column() {
+      Web({ src: 'www.example.com', controller: this.controller })
+        .userAgent(this.ua)
+    }
+  }
+}
+```
+
 ### getTitle
 
 getTitle(): string
@@ -4250,7 +4286,7 @@ Saves the cookies in the memory to the drive. This API uses an asynchronous call
 
 | Name  | Type                  | Mandatory| Description                                              |
 | -------- | ---------------------- | ---- | :------------------------------------------------- |
-| callback | AsyncCallback\<void> | Yes  | Callback used to return the operation result.|
+| callback | AsyncCallback\<void> | Yes  | Callback used to return whether the cookies are successfully saved.|
 
 
 **Example**

en/application-dev/web/web-component-overview.md

@@ -8,7 +8,7 @@ In addition to displaying web page content on applications, the **Web** componen
 
 - **Page interaction**: supports a wide range of page interaction modes, which allow you to set the dark mode for frontend pages, load pages in a new window, manage location permissions and cookies, and use frontend page JavaScript code on the application.
 
-- **Page debugging**: uses DevTools to debug frontend pages.
+- **Page debugging**: uses [DevTools](web-debugging-with-devtools.md) to debug frontend pages.
 
 
 To help you better understand the features of the **Web** component, the following sections will exemplify use of the **Web** component in common application scenarios.