improvement: 修改bug，优化

src/pages/raffle.wpy

@@ -269,7 +269,7 @@
       isInnerDone: 'hide',
       innerActivity: '',
       isError: false,
-      code: ''
+      code: '',
     },
     methods: {
       check() {
@@ -282,9 +282,9 @@
         let detail = e.$wx.detail || {};
         function goprize() {
           updateUserPhone(detail).then(() => {
-            that.confirmRaff();
             wx.setStorageSync('hasPhone', true);
             that.hasPhone = true;
+            that.joinin();
           }).catch(() => {
             that.btnfont = '立即参与';
           });
@@ -371,6 +371,10 @@
         this.code = '';
       },
       checkCode () {
+        if(this.code === '') {
+          this.isError = true;
+          return;
+        }
         checkInnerCode({code: this.code}).then(data => {
           if (+data.checkCode === 0) {
             this.closeModal();
@@ -391,8 +395,8 @@
       }
     },
     watch: {
-      code(val) {
-        if (!val.length && this.isError) {
+      code(val,oldval) {
+        if (val!==oldval && this.isError) {
           this.isError = false;
         }
       }