代码编辑器:
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
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<script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.js"></script>
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<script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
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<style>body {margin:20px}</style>
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<div class="alert alert-success">成功!很好地完成了提交。</div>
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<div class="alert alert-info">信息!请注意这个信息。</div>
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<div class="alert alert-warning">警告!请不要提交。</div>
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<div class="alert alert-danger">错误!请进行一些更改。</div>
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