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代码编辑器：

<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="/static/lib/bootstrap/4.0.0/css/bootstrap.min.css">
<script src="/static/lib/jquery/3.3.1/jquery.min.js"></script>
<script src="/static/lib/popper.js/1.12.9/umd/popper.min.js"></script>
<script src="/static/lib/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<div class="container">
  <h2>基本的模态框</h2>
  
  <button type="button" class="btn btn-primary" data-toggle="modal" data-target="#myModal">
    打开模态框
  </button>
   
  
  <div class="modal fade" id="myModal">
    <div class="modal-dialog modal-sm">
      <div class="modal-content">
   
        
        <div class="modal-header">
          <h4 class="modal-title">模态框头部</h4>
          <button type="button" class="close" data-dismiss="modal">×</button>
        </div>
   
        
        <div class="modal-body">
          模态框内容..
        </div>
   
        
        <div class="modal-footer">
          <button type="button" class="btn btn-secondary" data-dismiss="modal">关闭</button>
        </div>
   
      </div>
    </div>
  </div>
</div>

运行结果：