element UI 表格序号倒序

    // 处理序号=》倒序
    indexMethods (index) {
      // currentpage当前页码，this.tableData.length总条数，index索引值
      if (this.tableData.length < 10) {
        return (this.tableData.length - index)
      } else {
        return (this.tableData.length - ((this.currentpage - 1) * 10) - index)
      }
    }

    <el-table
      :data="tableData"
      border
      style="width: 100%;">
      <el-table-column
        type="index"
        align="center"
        label="序号"
        width="106">
      </el-table-column>