<el-table :data="dataList">
 <el-table-column label="id" prop="id"></el-table-column>
 <el-table-column label="name" prop="name">
 <template v-slot="props">
  <el-input-number
  :min="0"
  v-model="props.row.count"
  @change="updateProduct($event)"
  size="mini"
 ></el-input-number>
 </template>
 </el-table-column>
</el-table>

export default {
 data() {
 return {
  dataList: [
  { id: 1, name: '001', count: 1 },
  { id: 2, name: '002', count: 2 },
  { id: 3, name: '003', count: 3 },
  ]
 }
 },
 methods: {
 updateProduct(value) {
  console.info(value)
 }
 }
}

<button data-get="数据按钮" @click="getRvent($event)">获取事件对象</button>

 // 获取事件对象e
 getRvent(e){
  console.log(e);
  e.srcElement.style.background="red";
 }

<button data-get="数据按钮" @click="getRvent($event)">获取事件对象</button>