element UI table获取行号

参考官方文档 Element - The world's most popular Vue UI framework
如下，使用属性 row-class-name

<el-table
    :data="tableData"
    style="width: 100%"
    :row-class-name="tableRowClassName">
    <el-table-column
      label="操作">
      <template slot-scope="scope">
        <el-button @click="handleClick(scope.row)" type="text" size="small">查看</el-button>
      </template>
    </el-table-column>
</el-table>

tableRowClassName ({ row, rowIndex }) {
    row.rowIndex = rowIndex;
},
handleClick (row){
    console.log(row.rowIndex) //行号索引值
}