css：animate.css@4.1.1和wow.js实现网页动画效果

<!-- 引入样式 animate.css -->
<link href="https://cdn.bootcdn.net/ajax/libs/animate.css/4.1.1/animate.min.css"
        rel="stylesheet">
<style>
.box {
  width: 300px;
  height: 300px;
  background-color: #eeeeee;
}
</style>
<!-- 必须加类名：animate__animated -->
<!-- 动画效果：animate__swing -->
<div class="box animate__animated animate__swing"></div>

<link href="https://cdn.bootcdn.net/ajax/libs/animate.css/4.1.1/animate.min.css"
        rel="stylesheet">
  <style>
    .box {
      width: 300px;
      height: 300px;
      background-color: #eeeeee;
      /* 让元素在下一屏幕显示 */
      margin-top: 1000px;
    }
  </style>
  <!-- 增加一个类名：wow -->
  <div class="box wow animate__animated animate__swing"></div>
  <!-- 引入并初始化 wow -->
  <script src="https://cdn.bootcdn.net/ajax/libs/wow/1.1.2/wow.min.js"></script>
  <script>
    var wow = new WOW({
      boxClass: 'wow',
      animateClass: 'animate__animated',
      offset: 0,
      mobile: true,
      live: true
    });
    wow.init();
  </script>