由于Vue3文档缺失，示例10也是也跑不起来，这边参考示例改动了一下。
改动的点主要是
this指向、$children相关的问题
在Vue3中移除了$children可以使用$ref替代
参考文章：计算坐标方法重写、文档示例
关键点：计算中的子组件取值使用ref绑定即可
对于循环的Dom树可以参考模板引用
完整代码：
<template><div class="user-canvas" @dragenter.prevent @dragover.prevent><div id="content" class="w-full pb-16"><grid-layoutclass="min-h-screen"ref="gridlayout":layout.sync="gridConfig.layout":col-num="60":row-height="30":is-draggable="draggable && gridConfig.configType !== 2":is-resizable="resizable && gridConfig.configType !== 2":vertical-compact="false":use-css-transforms="true"><!-- <grid-item class="h-full relative z-50" :x="0" :y="2" :w="12" :h="2" i="s1">--><!-- </grid-item>--><grid-itemref="gridItemRefs"v-for="item in gridConfig.layout"class="h-full select-none relative overflow-hidden":static="item.static":x="item.x":y="item.y":w="item.w":h="item.h":i="item.i":minW="8":minH="2"><div>{{item.key}}</div></grid-item></grid-layout></div></div></template>
import { ref, onUnmounted } from 'vue'// refconst gridlayout = ref(null)const gridItemRefs = ref([])// 计算坐标用let mouseXY = { x: null, y: null }let DragPos = { x: null, y: null, w: 4, h: 4, i: null }const gridConfig ={layout:[{x: 0,y: 3,w: 4,h: 12,i: '1',static: true,moved: false}]}const handleDrop = (event) => {event.preventDefault()// TODO}// 开始拖动const drag = (e) => {let parentRect = document.getElementById('content').getBoundingClientRect()let mouseInGrid = falseif (mouseXY.x > parentRect.left &&mouseXY.x < parentRect.right &&mouseXY.y > parentRect.top &&mouseXY.y < parentRect.bottom) {mouseInGrid = true}if (mouseInGrid === true && gridConfig.layout.findIndex((item) => item.i === 'drop') === -1) {gridConfig.layout.push({x: (gridConfig.layout.length * 2) % 12,y: gridConfig.layout.length + 12, // puts it at the bottomw: gridConfig.dragType?.w || 4,h: gridConfig.dragType?.h || 4,i: 'drop'})}let index = gridConfig.layout.findIndex((item) => item.i === 'drop')if (index !== -1) {try {gridItemRefs.value[gridConfig.layout.length - 1].$refs.item.style.display = 'none'} catch {}let el = gridItemRefs.value[index]// el.dragging = { top: mouseXY.y - parentRect.top, left: mouseXY.x - parentRect.left }let new_pos = calcXY(el, mouseXY.y - parentRect.top, mouseXY.x - parentRect.left, 1, 1)if (mouseInGrid === true) {// 红色游标部分gridlayout.value.dragEvent('dragstart','drop',new_pos.x,new_pos.y,gridConfig.dragType?.h || 4,gridConfig.dragType?.w || 4)DragPos.i = String(index)DragPos.x = gridConfig.layout[index].xDragPos.y = gridConfig.layout[index].y}if (mouseInGrid === false) {gridlayout.value.dragEvent('dragend', 'drop', new_pos.x, new_pos.y, 1, 1)gridConfig.layout = gridConfig.layout.filter((obj) => obj.i !== 'drop')}}}// 释放拖动const dragend = (e) => {let parentRect = document.getElementById('content').getBoundingClientRect()let mouseInGrid = falseif (mouseXY.x > parentRect.left &&mouseXY.x < parentRect.right &&mouseXY.y > parentRect.top &&mouseXY.y < parentRect.bottom) {mouseInGrid = true}if (mouseInGrid === true) {gridlayout.value.dragEvent('dragend', 'drop', DragPos.x, DragPos.y, 1, 1)gridConfig.addGridItem(DragPos)gridConfig.layout = gridConfig.layout.filter((obj) => obj.i !== 'drop')}gridItemRefs.value[gridConfig.layout.length - 1].$refs.item.style.display = 'none'}// 计算坐标const calcXY = (el, top, left, width, height) => {const colWidth = el.calcColWidth()let x = Math.round((left - 10) / (colWidth + 10))let y = Math.round((top - 10) / (el.rowHeight + 10))const _width = width || el.innerWconst _height = height || el.innerHx = Math.max(Math.min(x, el.cols - _width), 0)y = Math.max(Math.min(y, el.maxRows - _height), 0)return { x, y }}// 加载完成后监听鼠标事件onMounted(() => {document.addEventListener('dragover',function (e) {mouseXY.x = e.clientXmouseXY.y = e.clientY},false)})// 销毁时关闭监听onUnmounted(() => {document.removeEventListener('dragover',function (e) {mouseXY.x = nullmouseXY.y = null},false)})
)