写项目时遇到这么个情况，把数据渲染出来后，多个计数器怎么绑定数据

我的解决方法：

/edit
// v-for="(item, index) in shoppingCard"
<div class="num">
  <Counter :num="item.num">
  	<template slot-scope="scope">
    	<el-input-number
          size="mini"
          v-model="scope.num"
          :min="1"
          @change="handleCounterChange(index, scope.num)">
        </el-input-number>
    </template>
  </Counter>
</div>

handleCounterChange (index, num) {
	// 同步仓库内的购物车数据
	// import { mapState, mapMutations } from 'vuex'
  this.shoppingCard[index].num = num
  this.setShoppingCard(this.shoppingCard)
}


// counter组件
<template>
  <div class="counter">
    <slot :num="num"></slot>
  </div>
</template>

<script>
export default {
  name: 'Counter',
  props: ['num']
}
</script>

<style lang="stylus" scoped></style>