HarmonyOS ArkWeb组件访问页面，如何按手机端样式展示

可以参考以下demo:

import web_webview from '@ohos.web.webview'
@Entry
@Component
struct WebTest {
  controller: web_webview.WebviewController = new web_webview.WebviewController()
  build() {
    Column(){
      Web({ src: 'https://www.index.com', controller: this.controller})
        .domStorageAccess(true)
        .onControllerAttached(()=>{
          this.controller.setCustomUserAgent('Mozilla/5.0 (xxx; VRD-AL10; HMSCore 6.3.0.331) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.88 HuaweiBrowser/12.0.4.1 Mobile Safari/537.36')
        })
    }
    .width('100%')
    .height('100%')
  }
}