模态框用于重要消息提示，并且用来阻止用户界面。应谨慎使用模态框，因为它们具有破坏性，如果过度使用，会很容易破坏用户体验。但是，在某些情况下，它们是适合使用的视图，并且加上一些动画将使其变得生动。

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }
    html,body {
      width: 100%;
      height: 100%;
    }
    .modal {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      opacity: 0;
      will-change: transform, opacity;
      background: rgba(0,0,0,0.4);
      transform: scale(1.15);
      transition: transform 0.1s cubic-bezier(0.465, 0.183, 0.153, 0.946), opacity 0.1s cubic-bezier(0.465, 0.183, 0.153, 0.946);
    }

    .modal.visible {
      pointer-events: auto;
      opacity: 1;
      transform: scale(1);
      transition: transform 0.3s cubic-bezier(0.465, 0.183, 0.153, 0.946), opacity 0.3s cubic-bezier(0.465, 0.183, 0.153, 0.946);
    }

    .content {
      position: fixed;
      left: 50%;
      top: 50%;
      transform: translate3d(-50%, -50%, 0);
      width: 200px;
      height: 200px;
      background: #fff;
      border-radius: 5px;
      box-shadow: 0 10px 20px rgba(0,0,0,0.6);
    }
  </style>
</head>
<body>
  <div class="modal" id="modal">
    <div class="content">
      <button id="close">关闭</button>
    </div>
  </div>
  <button id="open">打开</button>
  <script>
    let open = document.getElementById('open')
    let close = document.getElementById('close')
    let modal = document.getElementById('modal')
    open.onclick = control
    close.onclick = control
    function control() {
      modal.classList.toggle('visible')
    }
  </script>
</body>
</html>

给模态框设置动画_animation

​​在线演示​​