/**
* 限制子元素的最大最小宽高
* ConstrainedBox({
Key key,
@required this.constraints,//限制条件
Widget child
})
*/
/**
*const BoxConstraints({
this.minWidth = 0.0,
this.maxWidth = double.infinity,
this.minHeight = 0.0,
this.maxHeight = double.infinity
})
*/











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