to method
Implementation
Future<void> to(String route, [int? index, String pageKey = 'ipage']) async {
int tabno = 0;
if (index != null) tabno = index;
String url = route;
if (tabno != parser.currentTab) parser.currentTab = tabno;
if (tabno != 0) url += ':$pageKey=$tabno';
// if (url != parser.histories[parser.currentTab].last)
// parser.histories[parser.currentTab].add(url); //url加入到当前页面的历史
//debugPrint('to:url=$url');
this.route =
await parser.parseRouteInformation(RouteInformation(location: url));
}