dashed
... solid 直线边框 dashed虚线边框 dotted点状边框 ...
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动画虚线边框，如此答案中所示。
Animated dashed border as seen in this answer.
youdao
每个虚线边框都代表一个单独的视觉帮助。
Each dotted border represents a separate visual aid.
如果该属性设置为true，则禁用事件将有他们周围虚线边框。
If this property is set to true, then disabled events will have a dashed border around them.
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