docs(Checkbox): reduce unnecessary reactive

src/checkbox/README.md

@@ -76,17 +76,15 @@ Use icon slot to custom icon.
 ```
 
 ```js
-import { toRefs, reactive } from 'vue';
+import { ref } from 'vue';
 
 export default {
   setup() {
-    const state = reactive({
+    const checked = ref(true);
-      checked: true,
+    return {
+      checked,
       activeIcon: 'https://img.yzcdn.cn/vant/user-active.png',
       inactiveIcon: 'https://img.yzcdn.cn/vant/user-inactive.png',
-    });
-    return {
-      ...toRefs(state),
     };
   },
 };

src/checkbox/README.zh-CN.md

@@ -88,17 +88,15 @@ export default {
 ```
 
 ```js
-import { toRefs, reactive } from 'vue';
+import { ref } from 'vue';
 
 export default {
   setup() {
-    const state = reactive({
+    const checked = ref(true);
-      checked: true,
+    return {
+      checked,
       activeIcon: 'https://img.yzcdn.cn/vant/user-active.png',
       inactiveIcon: 'https://img.yzcdn.cn/vant/user-inactive.png',
-    });
-    return {
-      ...toRefs(state),
     };
   },
 };

src/checkbox/demo/index.vue

@@ -155,8 +155,6 @@ export default {
       result3: [],
       checkAllResult: [],
       horizontalResult: [],
-      activeIcon: 'https://img.yzcdn.cn/vant/user-active.png',
-      inactiveIcon: 'https://img.yzcdn.cn/vant/user-inactive.png',
     });
 
     const group = ref();
@@ -181,6 +179,8 @@ export default {
       setRefs,
       checkAll,
       toggleAll,
+      activeIcon: 'https://img.yzcdn.cn/vant/user-active.png',
+      inactiveIcon: 'https://img.yzcdn.cn/vant/user-inactive.png',
     };
   },
 };