element-UI el-table修改input值视图不更新问题

 <input class="inputs" type="text"v-model="scope.row.molecule">

 <input @input="changeMolecule($event,scope.row)" class="inputs" type="text" 
 			 v-model="scope.row.molecule">

changeMolecule(event, row) {
	row.molecule=event.target.value
},

changeMolecule(data, index, row) {
  this.topicList.forEach(item=>{
    if(item.targetId===row.targetId){
      this.$set(item,'molecule',row.molecule)
    }
  })
},

 <el-table :data="topicList" border height="60vh" style="width: 100%">
   <el-table-column label="指标" prop="targetTitle" width="180"></el-table-column>
   <el-table-column label="指标计算方法" prop="computingMethod"></el-table-column>
   <el-table-column label="分子/分母（自动计算）" width="300">
     <template scope="scope">
       <div class="input-div">
         <input @input="changeMolecule(topicList,scope.$index,scope.row)" class="inputs" type="text"
                v-model="scope.row.molecule">
         <span class="divide">/</span>
         <input @input="changeDenominator(topicList,scope.$index,scope.row)" class="inputs" type="text"
                v-model="scope.row.denominator">
         <span class="divide"
               v-if="scope.row.molecule&&!isNaN(Number(scope.row.molecule))&& scope.row.denominator&&!isNaN(Number(scope.row.denominator))">
           {{(scope.row.molecule/scope.row.denominator*100).toFixed(2)+'%'}}
         </span>
       </div>
     </template>
   </el-table-column>
 </el-table>
changeMolecule(data, index, row) {
	//两种都可以
  	this.$set(data, index, row)
    //this.$set(this.topicList,index,row)
},