UNPKG
牆內unpkg基本沒法訪問，可以改用 unpkg.zhimg.com
<script src="https://unpkg.zhimg.com/vue"></script>
<script src="https://unpkg.zhimg.com/markdown-it@12.0.2/dist/markdown-it.js"></script>
<script src="https://unpkg.zhimg.com/element-ui/lib/index.js"></script>
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