diff --git a/vue2-tutorials/single-file/demo2/src/store/modules/count.js b/vue2-tutorials/single-file/demo2/src/store/modules/count.js
index 1305d2f..bf68434 100644
--- a/vue2-tutorials/single-file/demo2/src/store/modules/count.js
+++ b/vue2-tutorials/single-file/demo2/src/store/modules/count.js
@@ -5,6 +5,11 @@ Vue.use(Vuex);
 const count = {
   namespaced: true,
   state: { num: 1, sum: 0 },
+  getters: {
+    bigSum(state) {
+      return state.sum * 10;
+    },
+  },
   actions: {
     // 奇数相加
     incrementOdd(context) {
diff --git a/vue2-tutorials/single-file/demo2/src/views/demo4/compontens/Count.vue b/vue2-tutorials/single-file/demo2/src/views/demo4/compontens/Count.vue
index 9ead57e..66c7853 100644
--- a/vue2-tutorials/single-file/demo2/src/views/demo4/compontens/Count.vue
+++ b/vue2-tutorials/single-file/demo2/src/views/demo4/compontens/Count.vue
@@ -1,6 +1,7 @@
 <template>
   <div>
     <h1>当前求和为:{{ $store.state.count.sum }}</h1>
+    <h1>当前求和为:{{ $store.getters["count/bigSum"] }}</h1>
     <select v-model.number="$store.state.count.num">
       <option :value="1">1</option>
       <option :value="2">2</option>