使用iview的Table組件導出CSV文件<template><div>     <Table :data="data" :columns="columns" ref="dataTable" />     <button @click="exportData">導出數據</button>     </div></template><script>export default {     data(){        return {            data:[                 {id:1,name:'名稱1',category:{id:21,name:'類別21'}},                 {id:2,name:'名稱2',category:{id:21,name:'類別21'}},                 {id:3,name:'名稱3',category:{id:22,name:'類別22'}},             ],            columns:[                 {title:'名稱',key:'name'},                 {title:'類別',key:'category',render:(createEl,params)=>                 createEl("span",params.row.category.name)},             ]         }     },    methods:{         exportData(){            this.$refs.dataTable.exportCsv({                filename:'test_export',                columns:this.columns,                data:this.data             })         }     } }上面代碼，網頁能正常顯示數據：名稱類別名稱1類別21名稱2類別21名稱3類別22但點擊 導出數據 按鈕后，導出的數據是這樣的：名稱類別名稱1[object Object]名稱2[object Object]名稱3[object Object]這種嵌套的數據正常的導出姿勢是什么？求大神指導！！