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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <link rel="stylesheet" href="http://cdn.static.w3big.com/libs/bootstrap/3.3.7/css/bootstrap.min.css"> <script src="http://cdn.static.w3big.com/libs/jquery/2.1.1/jquery.min.js"></script> <script src="http://cdn.static.w3big.com/libs/bootstrap/3.3.7/js/bootstrap.min.js"></script> </head> <body> <div class="container"> <h2>实例</h2> <div class="center-block" style="width:150px;background-color:#ccc;">该 div 显示在中间</div> </div> </body> </html>