JavaScript模拟滑动手势

news2024/9/22 1:10:46

双击回到顶部

左滑动

右滑动

代码展示

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Gesture Example</title>
    <style>
      body {
        margin: 0;
        height: 200vh;
      } /* 模拟长页面 */
      .notification {
        position: fixed;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        padding: 20px;
        background-color: rgba(0, 0, 0, 0.7);
        color: white;
        font-size: 24px;
        border-radius: 10px;
        opacity: 0;
        transition: opacity 0.5s ease, transform 0.5s ease;
      }
      .notification.show {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1.1);
      }
    </style>
  </head>
  <body>
    <div class="notification" id="notification"></div>
    <div style="height: 30vh; background-color: rgb(178, 129, 129)"></div>
    <div style="height: 30vh; background-color: rgb(141, 40, 40)"></div>
    <div style="height: 30vh; background-color: rgb(135, 85, 85)"></div>
    <div style="height: 30vh; background-color: rgb(209, 188, 188)"></div>
    <div style="height: 30vh; background-color: rgb(203, 44, 44)"></div>
    <script>
      //在dom完全加载后执行
      document.addEventListener("DOMContentLoaded", () => {
        let touchStartX = 0;
        let touchStartY = 0;
        let touchEndX = 0;
        let touchEndY = 0;
        let lastTap = 0;

        const notification = document.getElementById("notification");

        //监听开始事件
        document.addEventListener("touchstart", (e) => {
          touchStartX = e.changedTouches[0].screenX;
          touchStartY = e.changedTouches[0].screenY;
        });
        //监听移动事件
        document.addEventListener("touchmove", (e) => {
          touchEndX = e.changedTouches[0].screenX;
          touchEndY = e.changedTouches[0].screenY;
        });
        //监听结束事件
        document.addEventListener("touchend", () => {
          handleGesture();
        });
        //监听双击事件
        document.addEventListener("touchend", (e) => {
          const currentTime = new Date().getTime();
          const tapLength = currentTime - lastTap;
          if (tapLength < 300 && tapLength > 0) {
            // 双击事件
            window.scrollTo({ top: 0, behavior: "smooth" });
          }
          lastTap = currentTime;
        });
        //判断手势
        function handleGesture() {
          const deltaX = touchEndX - touchStartX;
          const deltaY = touchEndY - touchStartY;

          if (Math.abs(deltaX) > Math.abs(deltaY)) {
            if (deltaX > 50) {
              showNotification("右滑动");
            } else if (deltaX < -50) {
              showNotification("左滑动");
            }
          }
        }
        //显示通知
        function showNotification(message) {
          notification.textContent = message;
          notification.classList.add("show");
          setTimeout(() => {
            notification.classList.remove("show");
          }, 1000);
        }
      });
    </script>
  </body>
</html>

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