mapState 工具功能添加

@@ -30,9 +30,6 @@ export default {
         }
         }
     },
     },
     computed: {
     computed: {
-        count() {
-            return this.$store.state.count
-        },
         isLogin() {
         isLogin() {
           return this.$store.state.isLogin
           return this.$store.state.isLogin
         }
         }

 <template lang="html">
 <template lang="html">
-  <div>{{ count }}</div>
+  <div>
+    count: {{ count }}
+    countPlusLocalState: {{countPlusLocalState}}
+  </div>
 </template>
 </template>
 
 
 <script>
 <script>
+import {
+    mapState
+} from 'vuex'
+
 export default {
 export default {
-  data () {
-    return {}
-  },
-  computed: {
-    count () {
-      return this.$store.state.count
+    data() {
+        return {
+          localCount: 10
         }
         }
     },
     },
-  mounted () {},
+    computed: mapState({
+      // 箭头函数可以让代码非常简洁
+      count: state => state.count,
+      // 传入字符串 'count' 等同于 `state => state.count`
+      countAlias: 'count',
+      // 想访问局部状态，就必须借助于一个普通函数，函数中使用 `this` 获取局部状态
+      countPlusLocalState (state) {
+        return state.count + this.localCount
+      }
+    }),
+    mounted() {},
     methods: {},
     methods: {},
     components: {}
     components: {}
 }
 }