解决三个小问题

src/components/cme/change-card.vue

@@ -18,7 +18,7 @@
       <section class="input-wrapper">
         <article class="code">
           <van-field
-            maxlength="23"
+            maxlength="26"
             v-model="activationCode"
             label="激活码"
             placeholder="请输入激活码"
@@ -49,8 +49,8 @@ export default {
   
   data() {
     return {
-      activationCode: "",
-      errorMsg: '请输入激活码'
+      activationCode: '',
+      errorMsg: ''
     };
   },
 
@@ -70,6 +70,10 @@ export default {
       if(val) {
         this.errorMsg = val;
       }
+    },
+    isShow(val) {
+      this.activationCode = '';
+      this.errorMsg = '';
     }
   },
 

src/views/merge-detail.vue

@@ -386,6 +386,7 @@ export default {
             _this.changeCardErrorMsg = "请输入正确的激活码";
           } else {
             _this.showChangeCard = false;
+            Toast("激活成功，开始学习");
             _this.getProjectParticularsV2();
           }
         } else {