Algorithm/index.html at master · JSH-data/Algorithm · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      .box {
        width: 100px;
        height: 100px;
        background-color: #fff700;
        border: 5px solid orange;
        cursor: pointer;
      }
    </style>
  </head>
  <body>
    <div class="box"></div>
    <script>
      const $box = document.querySelector(".box");

      const initialMousePos = { x: 0, y: 0 };

      const offset = { x: 0, y: 0 };

      const move = (e) => {
        offset.x = e.clientX - initialMousePos.x;
        offset.y = e.clientY - initialMousePos.y;

        $box.style.transform = `translate3d(${offset.x}px, ${offset.y}px, 0)`;
      };

      $box.addEventListener("mousedown", (e) => {
        initialMousePos.x = e.clientX - offset.x;
        initialMousePos.y = e.clientY - offset.y;

        document.addEventListener("mousemove", move);
      });
      document.addEventListener("mouseup", () => {
        document.removeEventListener("mousemove", move);
      });
    </script>
  </body>
</html>