//正常  
<ul id="example-1">  
  <li v-for="item in object">  
    {{ item.message }}  
  </li>  
</ul>  
//索引；  
<div v-for="(value, key, index) in object">  
  {{ index }}. {{ key }}: {{ value }}//索引：0，1...  
</div>  

殊的例子：利用underCodejs中_.grouBy()按照ClassType大、中、小半分組；主要：（val，key） in classArr獲取“鍵”：

<el-row class="class-box" v-for="(val,key) in classArr">
	<el-col :span="20" :offset="1" class="class-box-title" >
		<p>{{key|formatGrade}}</p>
	</el-col>
	<div class="class-item"  v-for="item in classArr[key]" @click="skipClassAdmin(item.Id)">
		<strong>{{item.Name}}</strong><br>
		<p>教師：{{item.TeacherName}}<span>{{item.Count}}</span>人</p>
	</div>
</el-row>
 

data:{  
    11:[  
        { "Id": 100147, "ServiceUnitId": 78, "Name": "中一班", "ClassType": 11, "Count": 28, "Cancel": false },  
        { "Id": 100148, "ServiceUnitId": 78, "Name": "中二班", "ClassType": 11, "Count": 26, "Cancel": false }  
      ],  
    12:[   
        { "Id": 100247, "ServiceUnitId": 78, "Name": "大一班", "ClassType": 11, "Count": 28, "Cancel": false },  
        { "Id": 100248, "ServiceUnitId": 78, "Name": "大二班", "ClassType": 11, "Count": 26, "Cancel": false }  
     ]