根据表格的Table-column 属性， 我们可以在操作栏中添加 :render-header="renderHeader"

然后通过js获取当前操作栏存在多少个按钮，去动态计算需要设置列宽为多少；

<el-table-column fixed="right" :label="t('table.operation')"  :render-header="renderHeader" > 
      <template #default="scope">
        <div class="optionDiv" style="white-space: nowrap; display: inline-block">
         <el-button type="success" size="small" :loading="scope.row.loading"
           @click="prmContractC.onDetails(scope.row, false)">
           详情
         </el-button>
         <el-button type="primary" size="small" :loading="scope.row.loading" @click="submitBtn(scope.row.id)"
           v-if="(scope.row.workflowState == '0' || scope.row.workflowState == '6' || scope.row.workflowState == '11') && userId == scope.row.createBy">
           提交审批
         </el-button>
         <el-button type="primary" size="small" :loading="scope.row.loading" @click="removeBtn(scope.row.id)"
           v-if="scope.row.work && scope.row.work.data && scope.row.work.data.length > 0 && scope.row.work.data[0].canCancel">
           撤回
         </el-button>
         <el-button type="primary" size="small" :loading="scope.row.loading"
           v-if="scope.row.work && scope.row.work.data && scope.row.work.data.length > 0 && scope.row.work.data[0].canSubmit"
           @click="prmContractC.onDetails(scope.row, true)">
           审核
         </el-button>
       </div>
     </template>
   </el-table-column>

import {h} from "vue";//引入h
export const renderHeader = ({column}: any) => {
  const divElement = document.querySelectorAll('.optionDiv');
  // 初始化最大按钮数量
  let maxButtons = -1;
  // 初始化包含最多按钮的元素
  let divWithMostButtons;
  divElement.forEach((item, index) => {
    // 获取当前 元素中的所有 button 元素
    const buttons = item.querySelectorAll('button');
    // 如果当前中的 button 数量大于已记录的最大数量
    if (buttons.length > maxButtons) {
      // 更新最大数量
      maxButtons = buttons.length;
      // 记录包含最多按钮的 
      divWithMostButtons = item;
    }
  });
  if(divWithMostButtons){
    let widthArr = [];
    const buttons = divWithMostButtons.querySelectorAll('button');
    buttons.forEach(function (item) {
      if (item.innerText) {
        widthArr.push(item.offsetWidth);
      }
    });
    // 重新设置列标题及宽度属性
    if (widthArr.length == 1) {
      column.width = widthArr.reduce((accumulator, currentValue) => accumulator + currentValue, 0)+20;
      return h('span', column.label);
    }else if (widthArr.length > 1) {
      column.width = widthArr.reduce((accumulator, currentValue) => accumulator + currentValue, 0) + 30;
      return h('span', column.label);
    } else {
      column.width = 0;
      return h('span', column.label);
    }
  }
};