diff --git a/model/user.js b/model/user.js
index 5421420..47db961 100644
--- a/model/user.js
+++ b/model/user.js
@@ -1,3 +1,5 @@
+const AV = require("../lib/av-live-query-weapp-min")
+ 
 function login() {
   return AV.Promise.resolve(AV.User.current()).then(user =>
     user ? (user.isAuthenticated().then(authed => authed ? user : null)) : null
@@ -6,4 +8,4 @@ function login() {
   })).catch(error => console.error(error.message));
 }
 
-module.exports=login;
\ No newline at end of file
+module.exports = login;
\ No newline at end of file
diff --git a/pages/classes/classes.js b/pages/classes/classes.js
index 85c06ee..aa29363 100644
--- a/pages/classes/classes.js
+++ b/pages/classes/classes.js
@@ -1,5 +1,5 @@
 const { Class } = require("../../model/class");
-const { login } = require("../../model/user");
+const login = require("../../model/user");
 const AV = require("../../lib/av-live-query-weapp-min.js");
 const { jsonify } = require('../../utils/leancloudutils');
 // pages/class/class.js
@@ -37,7 +37,7 @@ Page({
    * 生命周期函数--监听页面加载
    */
   onLoad: function (options) {
-    
+    login();
   },
 
   /**