您可以在hidden模式下打开InAppBrowser，同时显示微调器，完成加载后隐藏微调器并显示InAppBrowser:

You can open InAppBrowser in hidden mode, meanwhile display a spinner, and when it finishes loading hide the spinner and show the InAppBrowser:

showSpinner() // implement by yourself
var popup = window.open(url, "_blank", "location=no,toolbar=no,hidden=yes");
popup.addEventListener("loadstop", function() {
  popup.show();
  hideSpinner(); // implement by yourself
});