<!DOCTYPE html> <html> <head> <title>Bootstrap 实例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/4.1.0/css/bootstrap.min.css"> <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script> <!--<script src="https://cdn.bootcss.com/popper.js/1.12.5/umd/popper.min.js"></script>--> <script src="https://cdn.bootcss.com/bootstrap/4.1.0/js/bootstrap.min.js"></script> </head> <body>
bootstrap 引入文件
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