同页面使用多个floatingActionButton会报错
flutter: The following assertion was thrown during a scheduler callback:
flutter: There are multiple heroes that share the same tag within a subtree.
flutter: Within each subtree for which heroes are to be animated (i.e. a PageRoute subtree), each Hero must
flutter: have a unique non-null tag.
flutter: In this case, multiple heroes had the following tag: <default FloatingActionButton tag>
flutter: Here is the subtree for one of the offending heroes:

heroTag的问题
修改成heroTag: null
关于heroTag解释:
/// The tag to apply to the button's [Hero] widget.
///
/// Defaults to a tag that matches other floating action buttons.
///
/// Set this to null explicitly if you don't want the floating action button to
/// have a hero tag.
///
/// If this is not explicitly set, then there can only be one
/// [FloatingActionButton] per route (that is, per screen), since otherwise
/// there would be a tag conflict (multiple heroes on one route can't have the
/// same tag). The material design specification recommends only using one
/// floating action button per screen.

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