specifications:[
 {
  specificationName:"颜色",
  specificationItem:[
   {value:"黄色"},
   {value:"黑色"}
   ]
 }
]

<table class="table table-bordered table-hover table-item spggdytable"
  id="ggxtable" v-show="isAddSpecifications">
 <thead>
 <tr>
  <th>排序</th>
  <th>规格项</th>
  <th>操作</th>
 </tr>
 </thead>
 <tbody>
 <tr v-for="(item,index) in specifications">
  <td>{{index}}</td>
  <td>{{item.specificationName}}</td>
  <td>
   <a href='#'> <img src='../img/common_edit@25.png' alt='修改'></a>
   <a href='#'><img src='../img/common_del@25.png' alt='删除'></a>
  </td>
 </tr>
 </tbody>
</table>
<table class="table table-bordered table-hover table-item spggdytable"
  id="ggztable" v-show="isAddSpecifications">
 <thead>
 <tr>
  <th>规格值</th>
  <th>操作</th>
 </tr>
 </thead>
 <tbody v-for="(item,index) in specifications">
 <tr v-for="(part,n) in item.specificationItem">
  <td>{{part.value}}</td>
  <td>
   <a href='#'> <img src='../img/common_edit@25.png' alt='修改'></a>
   <a href='#'><img src='../img/common_del@25.png' alt='删除'></a>
  </td>
 </tr>
 </tbody>
</table>