成员变量 类型: String # static readonly baseline VerticalAlignment.baseline,baseline Default Value: 'baseline' 类型: String # static readonly bottom VerticalAlignment.bottom,bottom Default Value: 'bottom' 类型: String # static readonly middle VerticalAlignment.middle,middle Default Value: 'middle' 类型: String # static readonly top VerticalAlignment.top,top Default Value: 'top'