element table 更改表头 表格样式_header-cell-style color无效果

                                                        <el-table :data="popContentR"  :header-cell-style="{
                                                                                                    'background-color': '#ccc',
                                                                                                    'color': 'rgb(103, 194, 58)',
                                                                                                    'border-bottom': '1px rgb(103, 194, 58) solid'
                                                                                                }">
                                                                <el-table-column width="230" property="occTime"  label="发生时间">
                                                                    <template slot-scope="scope">
                                                                        <span style="font-weight: bold">{{scope.row.occTime}}</span>
                                                                    </template>
                                                                </el-table-column>
                                                                <el-table-column width="200" property="publish_time" label="更新时间"></el-table-column>
                                                            </el-table>
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