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Container(
width: 24,
height: 0,
decoration: new BoxDecoration(
border: Border(
// 四個(gè)值 top right bottom left
bottom: BorderSide(
color: Colors.white,
width: ScreenUtil().setHeight(16),
style: BorderStyle.solid),
right: BorderSide(
color: Colors.transparent,
width: 12,
style: BorderStyle.solid),
left: BorderSide(
color: Colors.transparent,
width: 12,
style: BorderStyle.solid),
),
),
),
