当表格中某行或者某个文字，需要单独设置

在表格table中加入:cell-style="cellStyle"

<el-table :data="tableData" row-key="id" border :tree-props="{children: 'children'}" :cell-style="cellStyle" height="450">
<el-table>

methods:{
    cellStyle ({ row }) {
      if (row.parentId !== 0) {
        return 'color:red'
      } else if (row.title == '新的菜单') {
        return 'color:yellow'
      }
    }
}