vue+elementui table表格点击单元格单元格改变背景色

<el-table
    :data="tableData"
    border
    @cell-click="cellclick"
    :cell-style="tableCellStyle">
</el-table>

data(){
	row:'',
	column:''
}

cellclick (row, column, cell, event) {
      this.row = row
      this.column = column
    },
tableCellStyle (row, rowIndex, column) {
      if (this.row && this.columnName) {}
      if (this.row === row.row && this.column === row.column) {
        return 'background-color:#ccc;'
      } else {
        return 'background-color:#fff;'
      }
    },