el-table 加 class="customer-no-border-table"

/*去掉表格单元格边框*/
   .customer-no-border-table th{
     border:none;
   }
.customer-no-border-table td,.customer-no-border-table th.is-leaf {
  border:none;
}
 /*表格最外边框*/
.customer-no-border-table .el-table--border, .el-table--group{
     border: none;
   }
  /*头部边框*/
   .customer-no-border-table thead tr th.is-leaf{
     border: 0px solid #EBEEF5;
     border-right: none;
   }
.customer-no-border-table thead tr th:nth-last-of-type(2){
  border-right: 0px solid #EBEEF5;
}
 /*表格最外层边框-底部边框*/
.customer-no-border-table .el-table--border::after,.customer-no-border-table .el-table--group::after{
     width: 0;
   }
.customer-no-border-table::before{
  width: 0;
}
.customer-no-border-table .el-table__fixed-right::before,.el-table__fixed::before{
  width: 0;
}
.customer-no-border-table .el-table__header tr th{
  background: #fff;
  color: #333333 ;
  padding: 3px ;
  fontWeight: 550 ;
  height: 36px ;
  border: 0px;
  font-size: 15px;
}