<el-tree?
? ? ? ? ?:data="treeData"?
? ? ? ? ?:props="defaultProps"?
? ? ? ? ?:load="loadNode"?
? ? ? ? ?@node-click="handleNodeClick"?
? ? ? ? ?lazy>
</el-tree>

data() {
    return {
        treeDataList: [],
        defaultProps: {
            id: 'id',
            label: 'name',
            children: 'children',
            parentId:'parentId',
            isLeaf: false,// 指定節(jié)點 是否為葉子節(jié)點，僅在指定了 lazy 屬性的情況下生效
        },
    }
},

loadNode(node, resolve) {    
    let that = this;
    if (node.level === 0) {
        that.getFatherData(resolve);//獲取頂級節(jié)點數(shù)據(jù)
    }
    if (node.level >= 1) {
        this.getChildrenData(node.data.id, resolve);//異步獲取子節(jié)點數(shù)據(jù)
        return resolve([]); // 防止在該節(jié)點沒有子節(jié)點時一直轉圈
    }
},

getFatherData(resolve) { 
    let options = {
        url: '',
        data: {
            parentId: 0
        }
    }
    let res = await $.fn.commonPlugin.commonAjaxRequest(options)
    if(res.flag){
        let data = res.data;
        data.forEach(item => {
            item={...item,isLeaf:true}
        });
        resolve(data)
    }
},

getChildrenData(parentId, resolve) { 
       let options = {
            url: '',
            data: {
                parentId
            }
        }
        let res = await $.fn.commonPlugin.commonAjaxRequest(options)
        if(res.flag){
            let data = res.data;
            data.forEach(item => {
                item={...item,isLeaf:false}
            });
            resolve(data)
        } 
    },