how can i make it possible say i have a unordered list of 17 items. so now i want to add a div tag just before the the 5th item and the closing div will go after the last item of the list. the result will look some thing like this.how can i make it possible say i have a unorder
阅读背景：
在第五个 之前添加 并在列表中的最后一个 之后添加另一个 ？
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