Web正如我上面的Edd所建议的,它们不是兄弟姐妹-所以你需要将选择器更改为父(.someContainer)。 但我也建议另一种方法,“积极”方法-设置选择器的第一个孩子没有想要的属性,而所有其他孩子都有它.someContainer:first-child { margin-top: 0 } .someContainer { margin-top: 50px } WebLa pseudo-clase :nth-child () de CSS coincide con uno o más elementos en función de su posición entre un grupo de hermanos. /* Selecciona cada cuarto elemento entre cualquier grupo de hermanos */ :nth-child (4n) { color: lime; } Sintaxis
CSS :first-child 伪元素 菜鸟教程
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:first-child - CSS MDN - Mozilla Developer
WebCS First is a tool that is free of charge and developed with several objectives, one of them being to provide computer science education to all students in an accessible way. It's our hope that... WebCS First is a cost-free computer science curriculum that anyone can teach. Designed for students ages 9-14 of all interests and experience levels, students learn collaboration … WebThe CSS styles to apply to the first child element. Note The :first-child selector is a pseudo-class that allows you to target an element that is the first child element within its parent. See also :last-child, :nth-child, :nth-last_child, and :only-child selectors. ooh raport