weex vuex使用問題

在weex中使用vuex，會報Cannot read property 'dispatch' of undefined,同樣的代碼在web下是能正常運行的，請教各位哪里寫錯了

entrt.js

import Vue from 'vue';
import weex from 'weex-vue-render';
import Vuex from 'vuex';

weex.init(Vue);
if (WXEnvironment.platform !== 'Web') {
    Vue.use(Vuex);
}

store/countModule.js

import Vue from 'vue';
import Vuex from 'vuex'
if (WXEnvironment.platform !== 'Web') {
Vue.use(Vuex);
}
const state = {
    count: 0
}
const mutations = {
    increment(state) {
        state.count++
    },
    decrement(state) {
        state.count--
    }
}
const actions = {
    increment: ({ commit }) => commit('increment'),
    decrement: ({ commit }) => commit('decrement'),
   
}

export default {
    state,
    actions,
    mutations
}

store/store.js

import Vue from 'vue';
import Vuex from 'vuex';
import countModule from './countModule';
if (WXEnvironment.platform !== 'Web') {
Vue.use(Vuex);
}
export default new Vuex.Store({
    modules: {
        countModule
    }
})

index.vue

<template>
  <div class="wrapper">
    <image :src="logo" class="logo" />
    <text class="greeting">The environment is ready!</text>
    <HelloWorld/>
    <Display/>
    <Count/>
  </div>
</template>

<script>
import store from './store/store';
import HelloWorld from './components/HelloWorld.vue';
import Count from './components/count.vue';
import Display from './components/display.vue';

export default {
  name: 'App',
  store,
  components: {
    HelloWorld,
    Count,
    Display
  },
  data () {
    return {
      logo: 'https://gw.alicdn.com/tfs/TB1yopEdgoQMeJjy1XaXXcSsFXa-640-302.png'
    }
  }
}
</script>

<style scoped>
  .wrapper {
    justify-content: center;
    align-items: center;
  }
  .logo {
    width: 424px;
    height: 200px;
  }
  .greeting {
    text-align: center;
    margin-top: 70px;
    font-size: 50px;
    color: #41B883;
  }
  .message {
    margin: 30px;
    font-size: 32px;
    color: #727272;
  }
</style>

count.vue

<template>
<div>
    <div class="btn" @click="increment()"><text class="btn-text">點擊+1</text></div>
</div>
</template>
<style scoped>
.btn{
    background-color: #2e3e4c;
    height: 50px;
    line-height: 50px;
    width:300px;
    margin:20px auto;
    
}
.btn-text{
    color: #fff;
    text-align: center;
}
</style>
<script>
import { mapGetters, mapActions } from 'vuex'
var modal = weex.requireModule('modal');
export default {
    methods:{
        increment(){
           // console.log(this.$store)
            this.$store.dispatch('increment'); 
        }
       
    },
    
}
</script>