Vue Elenent实现表格相同数据列合并

<el-table
 :span-method="objectSpanMethod4" //在el-table里面添加合并单元格属性
 >

data(){
return{
 orderdata:null,// 后端将数据查询出来后，绑定到orderdata里面
}
},
 methods: {
flitterData4(){
  let spanOneArr = []
  let concatOne = 0
  //let spanOneArr1 = []
  //let concatOne1 = 0
  this.orderdata.forEach((item,index)=>{//循环后端查询出来的数据(orderdata)
  if(index === 0){
   spanOneArr.push(1)
  }else{
   //name 修改
   if(item.ENTERNAME === this.orderdata[index - 1].ENTERNAME){ //第一列需合并相同内容的字段
   spanOneArr[concatOne] += 1
   spanOneArr.push(0)
   }else{
   spanOneArr.push(1)
   concatOne = index
   }
   //if(item.coachName === this.coachdata[index - 1].coachName){ //第二列需合并相同内容的判断条件
   //spanOneArr1[concatOne1] += 1
   //spanOneArr1.push(0)
   /