<div id="taskContainer" style="display: block;"> <table class="table table-bordered table-hover" id="taskTable" cellpadding="0" cellspacing="0"> <thead> <tr> <th>任务执行人</th> <th>完成状态</th> <th>完成时间</th> </tr> </thead> <tbody id="taskTableBody"> @{ var listExecution = Model.listtaskexecution; if (listExecution != null && listExecution.Count > 0) { foreach (var item in Model.listtaskexecution) { <tr> <td>@(item.executbyname == null ? "" : item.executbyname)</td> <td>@(item.executon == null ? "待完成" : "已完成")</td> <td>@(item.executon)</td> </tr> } } } </tbody> </table> @{ if (Model.listtaskexecution != null && Model.listtaskexecution.Count > 0) { foreach (var exectionItem in Model.listtaskexecution) { <div class="clearfix" style="margin-top:2rem; margin-bottom: 1em;"> <div class="operatorDetail"> <div class="left operatorImg"> <img class=".left" src="@exectionItem.avatar"> </div> <div class="left operatorContent"> <div class="operatorInfo"> <h3> @exectionItem.executbyname </h3> <p> @exectionItem.executon </p> </div> <p>@exectionItem.executiondescription</p> @{ if (exectionItem.listimgurl != null && exectionItem.listimgurl.Count > 0) { foreach (var imgItem in exectionItem.listimgurl) { <div class="itemImg left"> <img src="@imgItem"/> </div> } } } </div> </div> </div> } } } </div>#taskContainer .operatorDetail:nth-last-child(1){ border-bottom:none;}
全选出了了啊 为什么啊
解决方案
The :nth-last-child(an+b) CSS pseudo-class matches an element that has an+b-1 siblings after it in the document tree, for a given positive or zero value for n, and has a parent element.
先看定义，nth 这种都是选择同级别最后一个元素。但是看你的结构是这样的：
.clearfix>.operatorDetail.clearfix>.operatorDetail.clearfix>.operatorDetail目标元素 .operatorDetail 都没有兄弟节点，是唯一一个，也就是全都是最后一个。所以就全被选中了。