v-for.
<div class="studentLi" v-for="(item,index) in students" :key="index">
   <div class="operationMsg">
     <ul>
       <li>
        <div>
          <el-radio-group @change="console1" v-model="item.studyStatus">
              <el-radio label="1"></el-radio>
              <el-radio label="2"></el-radio>
              <el-radio label="3"></el-radio>
              <el-radio label="4"></el-radio>
          </el-radio-group>
        </div>
       <div>
       </div>
      </li>
     </ul>
   </div>
</div> has also tried to use vmurmodelling "students [index] .studyStatus", even if you click console1. 
 ask how to bind here. 
studyStatus attribute I added in the mounted traversal.
 solved: 
 because the students is passed from the front, I can just add attributes in the previous iteration, which seems to be a matter of order. 
 go back and relearn the vue life cycle 
