fix docs check

Signed-off-by: Nlaosan_ted <wangruichang@huawei.com>

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

@@ -170,7 +170,20 @@ struct WebComponent {
 ### 创建对象
 
 ```ts
-controller: web_webview.WebviewController = new web_webview.WebviewController();
+// xxx.ets
+import web_webview from '@ohos.web.webview'
+
+@Entry
+@Component
+struct WebComponent {
+  controller: web_webview.WebviewController = new web_webview.WebviewController();
+
+  build() {
+    Column() {
+      Web({ src: 'www.example.com', controller: this.controller })
+    }
+  }
+}
 ```
 
 ### loadUrl