JavaScript 可拖曳 div

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Drag</title>
    <style>
        .drag {
            border: 1px solid red;
            position: absolute;
            top: 0;
            left: 0;
            width: 100px;
            height: 100px;
        }
    </style>
</head>
<body>
<div class="drag"></div>
<script>
    let dragging = false;
    let position = null;
    const dragEle = document.querySelector('.drag');
    dragEle.addEventListener("mousedown", e => {
        dragging = true;
        position = [e.clientX, e.clientY];
    });

    document.addEventListener("mousemove", e => {
        if (!dragging) return;
        const x = e.clientX;
        const y = e.clientY;
        const moveX = x - position[0];
        const moveY = y - position[1];
        const left = parseInt(dragEle.style.left || 0);
        const top = parseInt(dragEle.style.top || 0);
        dragEle.style.left = left + moveX + 'px';
        dragEle.style.top = top + moveY + 'px';
        position = [x, y];
    });

    document.addEventListener('mouseup', e => {
        dragging = false;
    })
</script>
</body>
</html>
JavaScript 可拖曳 div

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