el-table 多级表头动态渲染问题

Question

表头渲染正常，但是内容显示不出来，请大佬指点下。

<el-table
 :data="tableData"
 border>
 <el-table-column prop="date"
 label="编辑"
 width="80"
 align="center"
 fixed>
 <template slot-scope="scope">
 <span class="el-icon-edit el-input__icon"
 style="cursor: pointer"
 @click="handleEdit(scope.$index, scope.row)">
 </span> </template> </el-table-column> <el-table-column label="基础信息">
 <el-table-column v-for="item in headersStage.basicInfos"
 show-overflow-tooltip
 :prop="item.infos"
 :label="item.name"
 :key="item.name"
 fixed
 >
 </el-table-column>
 </el-table-column> <el-table-column label="附件">
 <el-table-column v-for="item in headersStage.dictStages"
 :prop="item.infos"
 :label="item.name"
 :key="item.name"
 show-overflow-tooltip
 >
 </el-table-column> </el-table-column></el-table>

 // 表头
let headersStage = {
    basicInfos: [
        {
            "name": "分类",
            "path": "systemCategory",

        },
        {
            "name": "名称",
            "path": "codeName",
        },
        {
            "name": "编码",
            "path": "localId",

        },
        {
            "name": "编码2",
            "path": "bimTypeId",
        }
    ],
    dictStages: [
        {
            name: "空气面积",
            path: "infos.coolCoilHeatTransArea"
        },
        {
            name: "高度",
            path: "infos.primFilterAlarm"
        },
        {
            name: "寬度",
            path: "infos.seasonChangeSet"
        }, {
            name: "面積",
            path: "infos.returnAirTemp"
        },{
            name: "氧气",
            path: "infos.returnAirCO2Set"
        }
    ]
}

//   表格数据
 
 let tableData = [
        {
            "infos":{
                "coolCoilHeatTransArea":"-901",
                "crossHeight":"-903",
                "primFilterAlarm":"6578-902",
                "seasonChangeSet":"567-903",
                "returnAirTemp":"346-901",
            },
            "codeName":"测试-978",
        },
        {
            "classCode":"ACATAH",
            "infos":{
                "coolCoilHeatTransArea":"0-901",
                "crossHeight":"9-903",
                "primFilterAlarm":"978-902",
                "seasonChangeSet":"789-903",
                "returnAirTemp":"3-901",
                "returnAirCO2Set":"322-789"
            },
            "codeName":"测试-78",
        }]