<el-table class="eltable" ref="multipleTable" :data="tableData" style="margin-top: 50px;width: 100%;"
                    :row-class-name="tableRowClassName" @row-click="rowClick">
                    <el-table-column v-for="(item, index) in tableTitleList" :label="item.name" :key="index"
                        :prop="item.prop" :width="item.width" align="center">
                    </el-table-column>
                </el-table>

方法：

   rowClick(row, column, event) {
            
            console.log(row,column);
            this.selectIndex = row.index;
        },
        // 行选中样式
        tableRowClassName({
            row,
            rowIndex
        }) {
            row.index = rowIndex 
            if (rowIndex == this.selectIndex) {
                return 'success-row';
            }
        },

样式：

::v-deep .success-row {
    background-color: #81D3F8 !important;
}