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:last-child 选择器没有生效，请问怎么回事？

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:last-child 选择器没有生效，请问怎么回事？

imageimage
如图，
.item1:last-child 选择器没有生效，请问怎么回事？


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.className:last-child: 匹配的是父元素的最后一个子元素，且同时满足类名为className的。两者缺一不可！


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