el-cascader动态加载

1. 需求：实现一个多层级的级联选择器，点击一级，动态加载下一级

<el-cascader-panel
        ref="cascader"
        @change="change"
        :props="props"
        :options="options"
        :show-all-levels="false"
      >
</el-cascader-panel>

props: {
	multiple: true,
	emitPath: false,
	lazy: true,
	async lazyLoad(node, resolve) {
		console.log(node)
		const { level } = node
		let stop_level = 4
		let list = []
		// 超过最大层级，停止向下加载
		let callback = () => {
			resolve(
				(list || []).map(ele => {
					return Object.assign(ele, {
						leaf: level >= stop_level,
						})
					})
				)
		}
		if (level == 1) {
			const { value } = node
			let nodes = await getOrgByType(value)
			let _nodes = nodes.data.map(item => ({
				value: item.id,
				label: item.orgName,
			}))
			resolve(_nodes)
			} else if (level == 2) {
				const { value } = node
				let nodes = await getDeptByOrgId(value)
				let _nodes = nodes.data.map(item => ({
					value: item.id,
					label: item.deptName,
					orgSid: item.orgSid,
				}))
				resolve(_nodes)
			} else if (level == 3) {
				const { value, orgSid } = node.data
				let obj = {
					orgId: orgSid,
					deptId: value,
					leaf: true,
				}
				let nodes = await getOrgUser(obj)
				let _nodes = nodes.data.map(item => ({
					value: item.userId,
					label: item.personName,
				}))
				resolve(_nodes)
			} else {
				callback()
			}
		},
	},

change(e) {
	let nodeObj = this.$refs["cascader"].getCheckedNodes()
	console.log("节点的值", e)
	console.log("节点全部数据", nodeObj)
},