to method
Implementation
void to(Uri uri) {
ToUri to = matchUri(uri);
var result = routerDelegate.setNewRoutePath(to);
bool completed = false;
result.whenComplete(() => completed = true);
assert(completed, "确保routerDelegate.setNewRoutePath内部实现是同步的,我们应该用其他方案来做Route结果,异步不好操纵");
}