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得引用popper.js文件
<script src="/Scripts/jquery/jquery.min.js" type="text/javascript"></script>
<script src="/Scripts/proper/popper.js" type="text/javascript"></script>
<script src="/Scripts/proper/esm/popper.js" type="text/javascript"></script>
<script src="/Scripts/proper/umd/popper.js" type="text/javascript"></script>
<script src="/Scripts/bootstrap/js/bootstrap.min.js" type="text/javascript"></script>
这里得注意，bootstrap的引用得在popper.js后面
popper.js下载链接：
链接：https://pan.baidu.com/s/1_DJ5on3PZS5OvqAL0XMfLw
提取码：z9kb