HarmonyOS WebviewController 加载的网页不显示

controller: web_webview.WebviewController = new web_webview.WebviewController()
  onPageShow() {
    const params:Params = router.getParams() as Params; // 获取传递过来的参数对象
    if (params) {
      let resultJson: Params = new Params();
      resultJson.item=params.item;
      this.AdData=resultJson.item
      this.url=this.AdData.ad_url
      console.info('http opageshow:' + this.url);
      //日志 http opageshow: https://www.huawei.com/
    }
  }
  build() {
    Column() {
      this.Title()
      Web({src:this.url, controller: this.controller })
// Web({ src: 'https://www.huawei.com', controller: this.controller })
// 这样可以显示。是哪里不对？
    }
    .width(CommonConstants.FULL_WIDTH)
    .height(CommonConstants.FULL_HEIGHT)
    .backgroundColor($r('app.color.page_background'))
  }