@cross-device-app-dev/font-size字体大小要求至少为8fp以便于阅读@cross-device-app-dev/grid-columns-span不推荐开发者将栅格中所有的GridCol子组件只设置span属性，且值与父组件的columns属性相等@cross-device-app-dev/grid-span-value在栅格布局组件GridCol中