【Vue 开发实战】生态篇 # 16：如何在Vue中使用Vuex

import Vue from 'vue'
import Vuex from 'vuex'
import App from './App.vue'
Vue.use(Vuex)
Vue.config.productionTip = false
const store = new Vuex.Store({
  state: {
    count: 0,
  },
  mutations: {
    increment(state) {
      state.count++
    }
  },
  // 异步操作   
  actions: {
    increment({commit}) {
      setTimeout(()=>{
        // state.count++ // 不要对state进行更改操作，应该通过commit交给mutations去处理
        commit('increment')
      }, 2000)
    }
  },
  // 类似计算属性   
  getters: {
    doubleCount(state) {
      return state.count * 2
    }
  }
})
new Vue({
  store,
  render: h => h(App),
}).$mount('#app')

<template>
  <div id="app">
    <h1>count：{{count}}</h1>
    <h2>doubleCount：{{$store.getters.doubleCount}}</h2>
    <button @click="$store.commit('increment')">commit：count++</button>
    <button @click="$store.dispatch('increment')">dispatch：count++</button>
  </div>
</template>
<script>
export default {
  name: 'app',
  computed: {
    count() {
      return this.$store.state.count
    }
  }
}
</script>
<style>
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
</style>