用vant uploader怎么实现上传图片并可拖曳图片设封面-群英

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效果图如下所示：

<!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>
    <link rel="stylesheet" href="public/vant/index.css" rel="external nofollow" >
    <script src="public/vue.min.js"></script>
    <script src="public/vant/vant.min.js"></script>
    <script src="public/sortable/Sortable.min.js"></script>
    <script src="public/draggle/vuedraggable.umd.js"></script>

</head>
<style>
    .img_uploader{display: flex;}
    .img_upload span {display: -webkit-box;display: -webkit-flex;display: flex;-webkit-flex-wrap: wrap;flex-wrap: wrap;}
    .img_upload_item {position: relative;margin: 0 8px 8px 0;cursor: pointer;}
    .preview-cover {position: absolute;bottom: 0;box-sizing: border-box;width: 100%;padding: 4px;color: #fff;font-size: 12px;text-align: center;background: rgba(0, 0, 0, 0.3);}
    .van-image__error,.van-image__img,.van-image__loading {object-fit: cover;}
</style>

<body>
    <div id="app">
        <div class="img_uploader">
            <van-uploader :after-read="onRead"> </van-uploader>
            <draggable class="img_upload" v-model="fileList" :group="{name:'imgs'}" @end="end" animation="200">
                <transition-group>
                    <div class="img_upload_item" v-for="(item,index) in fileList" :key="index" @click="previewImg(fileList,index)">
                        <div class="van-image van-uploader__preview-image">
                            <img :src="item.content" alt="图片" class="van-image__img">
                            <div class="van-uploader__preview-cover">
                                <div class="preview-cover van-ellipsis" v-if="index == 0">封面图</div>
                            </div>
                        </div>
                        <div class="van-uploader__preview-delete" @click="delImg(index)">
                            <i class="van-icon van-icon-cross van-uploader__preview-delete-icon"></i>
                        </div>
                    </div>
                </transition-group>
            </draggable>
        </div>
    </div>
</body>
<script>
    var app = new Vue({
        el: "#app",
        components: {
            vuedraggable: window.vuedraggable, //当前页面注册拖拽组件
        },
        data() {
            return {
                fileList: [
                    {content: 'https://img01.yzcdn.cn/vant/leaf.jpg',name: '12'},
                    {content: 'images/banner1.png',name: '12'},
                    {content: 'images/banner2.png',name: '12'},
                    {content: 'images/banner3.png',name: '12'},
                    {content: 'images/banner4.png',name: '12'},
                ],
            }
        },
        methods: {
            // 删除图片
            delImg(index) {
                if (isNaN(index) || index >= this.fileList.length) {
                    return false
                }
                let tmp = []
                for (let i = 0, len = this.fileList.length; i < len; i++) {
                    if (this.fileList[i] !== this.fileList[index]) {
                        tmp.push(this.fileList[i])
                    }
                }
                this.fileList = tmp
            },
            onRead(file) { // 上传图片到图片服务器
                this.fileList.push(file) 
                console.log(file)
            },
            // 点击预览
            previewImg(images, index) {
                let listSrc = [];
                this.fileList.forEach(function(v,i){
                    listSrc.push(v.content)
                })
                vant.ImagePreview({
                    images:listSrc,
                    startPosition: index,
                    closeable:true
                });
            },
            // 拖拽结束后 获取刚刚拖动的数据
            end(e) {
                var _oldIndex = e.oldIndex
                var _oldItem = this.fileList[_oldIndex]
                console.log(_oldItem);
            },
        }
    })
</script>

</html>

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