拖曳排序-526互联

<!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>
        .list-item {
            display: flex;
            align-items: center;
            justify-content: center;
            background: #f50;
            height: 30px;
            width: 300px;
            color: #fff;
            cursor: move;
            user-select: none;
            border-radius: 5px;
            margin-bottom: 10px;
        }

        .list-item.moving {
            background: transparent;
            color: transparent;
            border: 1px dashed #ccc;
        }
    </style>
</head>
<!-- 使用filp 动画 -->
<body>
    <div class="list">
        <div class="list-item" draggable="true">1</div>
        <div class="list-item" draggable="true">2</div>
        <div class="list-item" draggable="true">3</div>
        <div class="list-item" draggable="true">4</div>
        <div class="list-item" draggable="true">5</div>
    </div>
    <script>
        const list = document.querySelector('.list')
        let sourceNode //当前正在拖动的是哪个元素
        // let filp;
        list.ondragstart = (e) => {
            setTimeout(() => {
                //延迟添加样式
                e.target.classList.add('moving')
            }, 0)

            sourceNode = e.target
            e.dataTransfer.effectAllowed='move'//修改鼠标
            console.log( e.dataTransfer.effectAllover);
            // file=new Filp(list.children,0.3)
        }
        list.ondragover = (e) => {
            e.preventDefault();
        }
        //使用父做事件代理
        list.ondragenter = (e) => {
            e.preventDefault();
            if (e.target === list || e.target === sourceNode) {
                return
            }
            const children = Array.from(list.children);
            const sourceIndex = children.indexOf(sourceNode);
            const targetIndex = children.indexOf(e.target);
            //往上拖
            if (sourceIndex < targetIndex) {
                //往下拖
                list.insertBefore(sourceNode, e.target.nextElementSibling);
            } else {
                //往上拖
                list.insertBefore(sourceNode, e.target);
            }
            // filp.play()
        }
        //移除moving
        list.ondragend=(e)=>{
            e.target.classList.remove('moving');
        }
        //默认情况下 元素不允许别的元素拖到自身之上的 拖动行为会取消
    </script>
</body>

</html>