在el-table-column里面写两个el-table-column，然后用header-cell-style将子表头隐藏
<el-table:data="tableData":span-method="objectSpanMethod"header-row-class-name="analyse-header"borderstyle="width: 100%":header-cell-style="handerMethod"
><el-table-column label="序号"></el-table-column><el-table-column label="分析类型"></el-table-column><el-table-columnlabel="占用类型"align="center"class-name="type-column"><el-table-column label="其中" align="center" width="80"><template slot-scope="scope"><div v-if="scope.row.childId">其中</div><div v-else>{{ scope.row.type }}</div></template></el-table-column><el-table-column label="类型" align="center" prop="type"></el-table-column></el-table-column><el-table-column label="占用面积（公顷）"></el-table-column><el-table-column label="占比"></el-table-column>
</el-table>
隐藏表头
//隐藏表头handerMethod({rowIndex}){if (rowIndex === 1) {//这里为了是将第二列的表头隐藏，就形成了合并表头的效果return {display: 'none'}}},
