HTML 拖拽排序

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

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            list-style: none;
        }

        div {
            width: 100%;
            height: 100vh;

        }

        p {
            width: 400px;
            padding: 20px;
            background: lightgreen;
            border-radius: 5px;
            margin: 20px;
            text-align: left;
            line-height: 20px;
        }

        p.draggable {
            border: 1px dashed #ccc;
            opacity: .5;
        }
    </style>
</head>

<body>
    <div id="box">
        <p draggable="true">1</p>
        <p draggable="true">2</p>
        <p draggable="true">3</p>
        <p draggable="true">4</p>
        <p draggable="true">5</p>
    </div>
</body>

<script>
    const box = document.getElementById('box')

    let sourceNode;
    box.ondragstart = (e) => {
        setTimeout(() => {
            e.target.classList.add('draggable')
        }, 0);
        e.dataTransfer.effectAllowed = 'move';
        sourceNode = e.target
    }

    box.ondragover = (e) => {
        e.preventDefault()
    }

    box.ondragenter = (e) => {
        e.preventDefault()
        if (e.target === box || e.target === sourceNode) { return }

        const sourceIndex = [...box.children].indexOf(sourceNode)
        const targetIndex = [...box.children].indexOf(e.target)

        if (sourceIndex < targetIndex) {
            // console.log('向下');
            box.insertBefore(sourceNode, e.target.nextElementSibling)
        } else {
            // console.log('向上'); 
            box.insertBefore(sourceNode, e.target)
        }
        console.log(e.target);
    }

    box.ondragend = (e) => {
        e.target.classList.remove('draggable')
    }
</script>

</html>
HTML 拖拽排序

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