js渐入效果

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <title>从左侧渐入</title>
  <style>
    /* 从左侧渐入 */
    div{
      background-color: rgb(138, 188, 209);
      width: 600px;
      height: 100px;
      margin: 10px;
    }
    .fade{
      opacity: 0;
      transform: translateX(-600px);
    }
    .left-in {
      /* 定义动画 */
      animation-duration: 1000ms; /* 动画时间 */
      animation-name: left-in; /* 关键帧名字 */
    }

    /* 定义关键帧 */
    @keyframes left-in {
      0% {
        opacity: 0;
        transform: translateX(-600px);
      }

      100% {
        opacity: 1;
        transform: translateX(0px);
      }
    }

    .right-in {
      /* 定义动画 */
      animation-duration: 1000ms; /* 动画时间 */
      animation-name: right-in; /* 关键帧名字 */
    }

    /* 定义关键帧 */
    @keyframes right-in {
      0% {
        opacity: 0;
        transform: translateX(600px);
      }

      100% {
        opacity: 1;
        transform: translateX(0px);
      }
    }

  </style>

</head>

<body>
<div style="height: 800px">box</div>
<div class="fade fade-left">模块一</div>
<div class="fade fade-left">模块二</div>
<div class="fade fade-left">模块三</div>
<div class="fade fade-left">模块四</div>
<div class="fade fade-right">模块五</div>
<div class="fade fade-left">模块六</div>
<div class="fade fade-right">模块六</div>
<div class="fade fade-left">模块六</div>
<div class="fade fade-right">模块六</div>
<div class="fade fade-left">模块六</div>
<div class="fade fade-right">模块六</div>
<div class="fade fade-left">模块六</div>

<script>
  function fadeIn () {
    window.onscroll = function () {
      // //div距离顶部的距离
      let fadeInBox = document.getElementsByClassName('fade');
      let i = 0;
      while (i < fadeInBox.length) {

        // 遍历所有匹配的元素
        let toBox = fadeInBox[i];
        let toTop = toBox.getBoundingClientRect().top;

        // 获取每个元素的class全部属性
        let boxClass = fadeInBox[i].className;
        console.log(boxClass);

        if (toTop<800 &&  boxClass.includes('fade-left')) {
          toBox.classList.add('left-in');
          toBox.classList.remove('fade','fade-left');
        }else if (toTop<800 && boxClass.includes('fade-right')) {
          toBox.classList.add('right-in');
          toBox.classList.remove('fade','fade-right');
        }
        i++;
        fadeIn();
      }
    }
  }
  fadeIn();
</script>
</body>

</html>
js渐入效果

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