ElevatedButton(
style: ButtonStyle(
shape:MaterialStateProperty.all(
BeveledRectangleBorder(borderRadius: BorderRadius.circular(0))
)
)，
child: child
onPressed: onPressed,
);
ElevatedButton(
style: ButtonStyle(
shape:MaterialStateProperty.all(
BeveledRectangleBorder(borderRadius: BorderRadius.circular(0))
)
)，
child: child
onPressed: onPressed,
);
