type check failed for prop “property“. Expected String with value “0“, got Number with value 0.

<el-table :data="caseData"  element-loading-text="给我一点时间" border fit highlight-current-row
          style="width: 100%;margin-top: 10px" >
    <el-table-column  align="center"
                     v-for="(item,index) in caseTargetIdandscroeList"
                     :key="index" :property="index" :label="item.name" >
        <template slot-scope="scope">
            <span>{{scope.row[scope.column.property]}}</span>
        </template>
    </el-table-column>
</el-table>

报错信息：Invalid prop: type check failed for prop "property". Expected String with value "0", got Number with value 0.

百度翻译后得知，property是字符串类型，index是数值类型，需要转型。不转也能使用，但是本人强迫症，见不得红色提示信息，通过过滤器转型成功，代码如下：

<el-table :data="caseData"  element-loading-text="给我一点时间" border fit highlight-current-row
          style="width: 100%;margin-top: 10px" >
    <el-table-column  align="center"
                     v-for="(item,index) in caseTargetIdandscroeList"
                     :key="index" :property="index|indexInfo" :label="item.name" >
        <template slot-scope="scope">
            <span>{{scope.row[scope.column.property]}}</span>
        </template>
    </el-table-column>
</el-table>

filters: {
    indexInfo: function (value) {
        return value.toString();
    }
},