uniapp はミニ プログラム ページに無料のドラッグ アンド ドロップ機能をどのように実装していますか?

<template>
    <view catchtouchmove="return">
        <view @click="play" @touchstart="hudun.touchstart" @touchmove="hudun.touchmove" @touchend="hudun.touchend">
            <canvas id="lottie-canvas" type="2d" style="width: 88px; height: 102px;"></canvas>
        </view>
    </view>
</template>

<script module="hudun">
    var startX = 0
    var startY = 0
    var lastLeft = 20
    var lastTop = 20

    function touchstart(event, ins) {
        ins.addClass(&#39;expand&#39;)
        var touch = event.touches[0] || event.changedTouches[0]
        startX = touch.pageX
        startY = touch.pageY
    }
    
    function touchmove(event, ins) {
        var touch = event.touches[0] || event.changedTouches[0]
        var pageX = touch.pageX
        var pageY = touch.pageY
        var left = pageX - startX + lastLeft
        var top = pageY - startY + lastTop
        startX = pageX
        startY = pageY
        lastLeft = left
        lastTop = top
        ins.selectComponent(&#39;.movable&#39;).setStyle({
            right: -left + &#39;px&#39;,
            bottom: -top + &#39;px&#39;
        })
    }
    
    function touchend(event, ins) {
        ins.removeClass(&#39;expand&#39;)
    }
    
    module.exports = {
        touchstart: touchstart,
        touchmove: touchmove,
        touchend: touchend
    }
</script>

<script>
    import lottie from &#39;lottie-miniprogram&#39;
    let insList = {} // 存放动画实例集合
    export default {
        props: {
            tag: String
        },
        data() {
            return {
                isPlay: true,
            }
        },
        methods: {
            init() {
                const query = uni.createSelectorQuery().in(this)
                query.select(&#39;#lottie-canvas&#39;).fields({ node: true, size: true }).exec((res) => {
                    const canvas = res[0].node
                    const context = canvas.getContext(&#39;2d&#39;)
                    const dpr = uni.getSystemInfoSync().pixelRatio
                    canvas.width = res[0].width * dpr
                    canvas.height = res[0].height * dpr
                    context.scale(dpr, dpr)
                    lottie.setup(canvas)
                    const ins = lottie.loadAnimation({
                        loop: true,
                        autoplay: true,
                        path: &#39;https://usongshu.oss-cn-beijing.aliyuncs.com/data/other/f8780255686b0bb35d25464b2eeea294.json&#39;,
                        rendererSettings: {
                            context,
                        },
                    })
                    insList[this.tag] = ins
                    setTimeout(() => {
                        this.isPlay = false
                        ins.stop()
                    }, 3000)
                })
            },
            play() {
                const ins = insList[this.tag]
                if (!this.isPlay) {
                    this.isPlay = true
                    ins.play()
                    setTimeout(() => {
                        this.isPlay = false
                        ins.stop()
                    }, 3000)
                }
            }
        },
        beforeDestroy() {
            delete insList[this.tag]
        }
    }
</script>

<style>
    .area
        position fixed
        right 20px
        bottom 20px
        width 88px
        height 102px
        z-index 99999

    .expand
        width 100vw
        height 100vh

    .movable
        position absolute
</style>

// 动画组件
import { HudunAnimation } from '@/components/hudun-animation/index'
Vue.component('HudunAnimation', HudunAnimation)

<HudunAnimation tag="index" ref="hudunRef"></HudunAnimation>

// 进入页面时初始化动画
mounted() {
    this.$refs.hudunRef.init()
}

this.ins = lottie.loadAnimation({})

catchtouchmove="return"