iview樹的修改某個節點，樹刷新後自動展開你剛纔展開的全部節點

return{

　　expandTable:{},

}

getOrgTree () {
                this.$Request.get('api/groups/tree', {}).then(res => {
                    console.log(res);
                    if (res && res.code === 0) {
                        if (Array.isArray(res.data)) {

                            this.orgTree = res.data.map(org => this.mapTree(org));
//                            this.orgTree.push({
//                                title: '無',
//                                label: '無',
//                                value: 0,
//                            })
                        }
                    }
                });
            },

mapTree (org) {
    const haveChildren = Array.isArray(org.children) && org.children.length > 0;
    let expand = false;
    if(this.expandTable[org.id+'']!==null &&this.expandTable[org.id+'']!==undefined ){
        expand = this.expandTable[org.id+''];
    }
    return {
        title: org.groupName,
        label: org.groupName,
        value: org.id,
        data: {...org},
        expand,
        children: haveChildren ? org.children.map(i => this.mapTree(i)) : []
    };
},

onToggleExpand(data){    this.expandTable[data.value+''] = data.expand;},