此枚举包含用于控制在布局阶段如何对齐子容器的值。
容器的主轴是布局子容器的主轴，即其伸缩方向。
| FlexStart | 项沿主轴的起始端对齐。 |
| Center | 项居中。 |
| FlexEnd | 项沿布局方向两端对齐。 |
| SpaceBetween | 各项均匀分布在线中；第一项位于线的起始端，最后一项位于线的末端。 |
| SpaceAround | 各项均匀分布在线中，且线的每一端都有额外空间。 |
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