列表的輪播顯示

需求：出現(xiàn)滾動后的列表輪播顯示

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Document</title>
    <style>
      .content {
        width: 200px;
        height: 340px;
        border: 1px solid #ddd;
        overflow: auto;
      }
      .detail {
        width: 100%;
        height: 34px;
        line-height: 34px;
        border-bottom: 1px solid #ddd;
        text-align: center;
      }
    </style>
  </head>
  <body>
    <div class="content">
      <div id="content-wrap">
        <div class="detail">1</div>
        <div class="detail">2</div>
        <div class="detail">3</div>
        <div class="detail">4</div>
        <div class="detail">5</div>
        <div class="detail">6</div>
        <div class="detail">7</div>
        <div class="detail">8</div>
        <div class="detail">9</div>
        <div class="detail">10</div>
        <div class="detail">11</div>
        <div class="detail">12</div>
        <div class="detail">13</div>
        <div class="detail">14</div>
        <div class="detail">15</div>
        <div class="detail">16</div>
      </div>
    </div>
    <script>
      window.onload = function() {
        const dom = document.getElementById("content-wrap");
        let timer = null;
        const animationEndHandler = evt => {
          dom.style.cssText = "transform:translate(0,0)";
          // appendChild()方法向數(shù)組末尾添加元素時，如果該元素已存在數(shù)組中，會刪除原有位置的元素，然后添加新的元素
          dom.appendChild(dom.children[0]);
          dom.appendChild(dom.children[0]);
        };
        const mouseEnterHander = evt => {
          clearInterval(timer);
        };
        const initInterval = () => {
          timer = setInterval(() => {
            if (dom.children[0]) {
              let scrollHeight = dom.children[0].offsetHeight;
              scrollHeight = parseInt(scrollHeight);
              dom.style.cssText = `transform:translate(0px,-${scrollHeight +
                34}px);transition:all 2s ease;`;
            }
          }, 3000);
        };
        const mouseLeaveHandler = () => {
          initInterval();
        };
        dom.addEventListener("mouseenter", mouseEnterHander);
        dom.addEventListener("mouseleave", mouseLeaveHandler);
        // 監(jiān)聽過渡動畫結束后觸發(fā)回調(diào)
        dom.removeEventListener("transitionend", animationEndHandler);
        dom.addEventListener("transitionend", animationEndHandler);
        initInterval();
      };
    </script>
  </body>
</html>
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