思想：action函数既支持同步也支持异步，和在组件中发送网络请求写法保持一致
步骤：

1. store中定义action
2. 组件中触发action

1- store中定义action

const API_URL = 'http://geek.itheima.net/v1_0/channels'

export const useCounterStore = defineStore('counter', ()=>{
  // 数据
  const list = ref([])
  // 异步action
  const loadList = async ()=>{
    const res = await axios.get(API_URL)
    list.value = res.data.data.channels
  }

  return {
    list,
    loadList
  }
})

2- 组件中调用action

<script setup>
    import { useCounterStore } from '@/stores/counter'
  const counterStore = useCounterStore()
  // 调用异步action
  counterStore.loadList()
</script>

<template>
    <ul>
    <li v-for="item in counterStore.list" :key="item.id">{{ item.name }}</li>
  </ul>
</template>