fix: handle the login logic of the bound wechat account

pages/login/login.js

@@ -127,6 +127,10 @@ Page({
               }
             }
           })
+        } else { // 已经绑定过微信
+          wx.redirectTo({
+            url: '/pages/permissions/permissions',
+          })
         }
       }).catch(e => {
         wx.hideLoading()