<div class="header">
          <el-button type="primary" :plain='this.A' @click="()=>{this.tableData=this.tableData1;this.A=false;this.B=this.C=this.D=true}" >政治监督</el-button>
          <el-button type="primary" :plain='this.B' @click="()=>{this.tableData=this.tableData2;;this.B=false;this.A=this.C=this.D=true}">开始阶段</el-button>
          <el-button type="primary" :plain='this.C' @click="()=>{this.tableData=this.tableData3;this.C=false;this.A=this.B=this.D=true}">落实阶段</el-button>
          <el-button type="primary" :plain='this.D' @click="()=>{this.tableData=this.tableData4;this.D=false;this.A=this.B=this.C=true}">完成阶段</el-button>
</div>

plain属性控制显示隐藏，也能解决切换页面不选中 ，点击立即执行事件控制逻辑

 data() {
    return {
      A:false,
      B:true,
      C:true,
      D:true,
写的很low，但方便简单