element ui的el-input-number修改数值失效的问题

<el-table-column slot="operationPrice" label="数量"  width="150"><template slot-scope="scope">
 <el-input-number v-model="scope.row.num"  :precision="0" :min="1" label="描述文字" @change="changeVal($event)">
</el-input-number>
</template>
</el-table-column>

changeVal() {
      this.$forceUpdate();
    },

<el-input v-model.number="form.frm_order_no" placeholder="订单号" @input="orderNoChange"></el-input>
 
orderNoChange() {
   this.$forceUpdate();
 },