代码
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<div id="app">
<div>购物车数量：{{count}}</div>
<button @click="addAsync">添加</button>
</div>
</body>
<script src="https://unpkg.com/vue/dist/vue.js"></script>
<script src="https://unpkg.com/vuex@3.1.2/dist/vuex.js"></script>
<script type="text/javascript">
function getData() {
return new Promise((resolve, reject) => {
setTimeout(() => {
console.log('getData success')
resolve()
}, 1000)
})
}
function getOtherData() {
return new Promise((resolve, reject) => {
setTimeout(() => {
console.log('getOtherData success')
resolve()
}, 2000)
})
}
const store = new Vuex.Store({
state: {
count: 0
},
mutations: {
increment(state) {
state.count++
}
},
actions: {
async actionA ({ commit }) {
commit('increment', await getData())
},
async actionB ({ dispatch, commit }) {
await dispatch('actionA') // 等待 actionA 完成
commit('increment', await getOtherData())
}
}
})
var vm = new Vue({
el: '#app',
store,
methods: {
addAsync() {
this.$store.dispatch('actionB')
},
},
computed: {
count() {
return this.$store.state.count
}
}
})
</script>
</html>
运行结果