1. Usually the css is imported first
2. Bootstrap relies on the jQuery library, all jQuery must be imported first
3. Finally, import the bootstrap js file, if your project does not use it To the bootstrap plug-in, you don’t need to import
1. All styles are added using class
2. Various effects can be accumulated on one element
[Related video recommendations:Bootstrap tutorial】
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<!--导入bootstrap的css样式文件-->
<link rel="stylesheet" href="dist/css/bootstrap.css">
<!--必须先导入jQuery-->
<script src="jquery-3.2.1.js"></script>
<script src="dist/js/bootstrap.js"></script>
<title>Bootstrap下载与导入</title>
</head>
<body>
<img src="1.jpg" alt="" class="img-circle img-responsive">
<div class="alert alert-warning">
<a href="#" data-dismiss="alert">
×
</a>
<strong>警告！</strong>您的网络连接有问题。
</div>
</body>
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