update dev's content

vuex_demo1/src/components/box.vue

@@ -1,20 +1,24 @@
 <template>
     <div>
-        这是box组件，测试,test
+        <div>这是box组件，测试,test</div>
+        <button @click="divide(2)">除2</button>
+        <div>count的值为：{{count}}</div>
     </div>
 </template>
 
 <script>
-
+import {mapState} from 'vuex'
 export default {
     data(){
         return{ }
     },
     methods:{
-
+        divide(num){
+            this.$store.commit('divide',num)
+        }
     },
     computed:{
-
+        ...mapState(['count'])
     }
 }
 </script>