css如何选择同一个class下的第一个div?

<div class="ms-u"></div> <div class="ms-u"></div> <div class="ms-u"></div>

   $(".vipCardItem:nth-child(1)").addClass("current");

.ms-u:nth-child(1) {......}

源文：https://blog.csdn.net/luckymaoyy/article/details/53666241

原文：https://www.cnblogs.com/shy1766IT/p/12272557.html