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flex属性结构图 父元素容器属性: flex-flow : 的简写, 设置容器主轴方向和是否换行place-content : 的简写, 设置项目在”主轴”上的对齐方式(多行)pla...
实例
选择器 选择符 解析 E:first-child 匹配父元素中的第一个子元素 E E:first-child 匹配父元素中最后一个E元素 E:nth-child(n) 匹配父元素中的第n个子元素E E:first-of-typ...