实现如图所示的样式

<el-table-column
      :render-header="contractRegister"
      width="130">
    </el-table-column>
    <el-table-column
      :render-header="deleteChecked"
      width="130">
 </el-table-column>

methods: {
    contractRegister() {
      return (
          <div>
            <el-button type="primary">合同登记</el-button>
          </div>
        )
    },
    deleteChecked() {
      return (
          <div>
            <el-button type="primary">删除选中</el-button>
          </div>
        )
    }