HarmonyOS WebView设置自定义UserAgent

import WebView from '@ohos.web.webview'; 
 
@Component 
export default struct UserAgent { 
  @State user: string = ''; 
  private controller: WebView.WebviewController = new WebView.WebviewController(); 
 
  build() { 
    Column() { 
      Web({ 
        src: $rawfile('userAgent.html'), 
        controller: this.controller 
      }) 
        .width('100%') 
        .height('50%') 
        .userAgent(this.user) 
        .onPageBegin(() => { 
          this.user = this.controller.getUserAgent() + '123456789' 
        }) 
    } 
    .height('100%') 
    .width('100%') 
  } 
}