HarmonyOS 使用webview打开包含视频的网页会白屏

// xxx.ets 
import web_webview from '@ohos.web.webview' 
import business_error from '@ohos.base' 
 
@Entry 
@Component 
struct WebComponent { 
  controller: web_webview.WebviewController = new web_webview.WebviewController(); 
  @State customUserAgent: string = 'test' 
 
  build() { 
    Column() { 
      Web({ src: 'www.huawei.com', controller: this.controller }) 
        .onControllerAttached(() => { 
          let userAgent = this.controller.getUserAgent() + this.customUserAgent; 
          //设置自定义UA 
          this.controller.setCustomUserAgent(userAgent); 
          //获取自定义UA 
          console.log("userAgent: " + this.controller.getCustomUserAgent()); 
        }) 
    } 
  } 
}