修改登录报错问题

src/pages/login/index.vue

@@ -37,6 +37,7 @@ export default {
   },
   data() {
     return {
+      code: "",
       session_key: "",
       shopName: "",
       logoUrl: "",
@@ -66,6 +67,32 @@ export default {
     };
   },
   created() {},
+  onShow() {
+    wx.checkSession({
+      success : () => {
+        //session_key 未过期，并且在本生命周期一直有效
+        wx.login({
+          success: res => {
+            this.code = res.code;
+          },
+          fail: err => {
+            reject(err);
+          }
+        }) //重新登录
+      },
+      fail : () => {
+        // session_key 已经失效，需要重新执行登录流程
+        wx.login({
+          success: res => {
+            this.code = res.code;
+          },
+          fail: err => {
+            reject(err);
+          }
+        }) //重新登录
+      }
+    })
+  },
   onLoad(options) {
     Object.assign(this.$data, this.$options.data()); //mpvue 的混合周期 使用小程序生命周期数据未初始化
     if (options.back) {
@@ -103,11 +130,8 @@ export default {
     },
     init() {
       return new Promise((resolve, reject) => {
-        wx.login({
-          success: res => {
-            if (res.code) {
         login
-                .miniLogin({ code: res.code,
+        .miniLogin({ code: this.code,
           spokesmanRelId : this.$store.state.spokesmanRelId,
           spokesmanGroupId : this.$store.state.spokesmanGroupId,
           spokesmanShopId : this.$store.state.spokesmanShopId
@@ -122,12 +146,6 @@ export default {
         .catch(err => {
           reject(err);
         });
-            }
-          },
-          fail: err => {
-            reject(err);
-          }
-        });
       });
     },
     getUserInfo: function(e) {