动机
由于非常想要一个像样的警告框，于是随便搞了个前端框架，仅作记录
demo
Well done!
Great! Here comes a link.
Whenever you need to, be sure to use margin utilities to keep things nice and tidy.
An example notice alert with an icon
An example notice question with an icon
An example danger alert with an icon
An example error alert with an icon
<div class="alert alert-success" role="alert" markdown='1'>
<h3 class="alert-heading"><i class="fa-fw fas fa-check"></i> Well done!</h3>
*Great!* Here comes [a link](#).
---
<p class="mb-0">Whenever you need to, be sure to use margin utilities to keep things nice and tidy.</p>
</div>
<div class="alert alert-primary d-flex align-items-center" role="alert" markdown='1'>
<i class="fas fa-info"></i> An example notice alert with an icon
</div>
<div class="alert alert-primary d-flex align-items-center" role="alert" markdown='1'>
<i class="fas fa-question"></i> An example notice question with an icon
</div>
<div class="alert alert-danger d-flex align-items-center" role="alert" markdown='1'>
<i class="fas fa-exclamation"></i> An example danger alert with an icon
</div>
<div class="alert alert-warning d-flex align-items-center" role="alert" markdown='1'>
<i class="fas fa-times"></i> An example error alert with an icon
</div>