Change the color of a row or cell in element ui

Element official website explanation

row-class-name	The callback method for the row's className, or a string can be used to set a fixed className for all rows.	Function({row, rowIndex})/String
row-style	The callback method of the row's style can also use a fixed Object to set the same Style for all rows.	Function({row, rowIndex})/Object
cell-class-name	The callback method of the cell's className, you can also use a string to set a fixed className for all cells.	Function({row, column, rowIndex, columnIndex})/String
cell-style	The callback method of the cell's style can also use a fixed Object to set the same Style for all cells.	Function({row, column, rowIndex, columnIndex})/Object

 1. Change the color of a cell according to conditions

          <el-table :data="rowData" border size="mini" :cell-style="styleBack">
            <el-table-column label="row1">11111</el-table-column>
            <el-table-column property="" label="row2">22222</el-table-column>
            <el-table-column property="" label="row3">33333</el-table-column>
            <el-table-column property="" label="row3">44444</el-table-column>
            <el-table-column property="" label="row3">55555</el-table-column>
            <el-table-column property="" label="row3">66666</el-table-column>
          </el-table>
 

          rowData: [
            { id: 1, num: 2 },
            { id: 2, num: 3 },
            { id: 3, num: 4 },
          ],

    styleBack({ row, column, rowIndex, columnIndex }) {
      if (columnIndex == 1 && row.num > 3) {
        return { backgroundColor: "#0c87ef" };
      }else if(columnIndex == 1){
       return { backgroundColor: "#FDD56A" };
      }
    },

result