diff --git a/.gitignore b/.gitignore
index 14ea590..9d10d27 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,6 +9,8 @@ $RECYCLE.BIN/
 .Spotlight-V100
 .TemporaryItems
 .Trashes
+lib_refer
+project.config.json
 
 # Node.js
 node_modules/
diff --git a/app.js b/app.js
index 4edc902..e7e59cf 100644
--- a/app.js
+++ b/app.js
@@ -1,6 +1,6 @@
 //app.js
 //导入leancloud库，与后台交互
-const AV = require('./utils/av-live-query-weapp-min');
+const AV = require('./lib/av-live-query-weapp-min');
 
 //初始化
 AV.init({
diff --git a/app.json b/app.json
index 8fac543..6294d88 100644
--- a/app.json
+++ b/app.json
@@ -8,7 +8,8 @@
     "pages/game/game",
     "pages/shouquan/shouquan",
     "pages/outside",
-    "pages/outside/outside"
+    "pages/outside/outside",
+    "pages/class/class"
   ],
   "window": {
     "backgroundTextStyle": "light",
diff --git a/readme.txt.txt b/constants/api.js
similarity index 100%
rename from readme.txt.txt
rename to constants/api.js
diff --git a/constants/appconstants.js b/constants/appconstants.js
new file mode 100644
index 0000000..d9b8108
--- /dev/null
+++ b/constants/appconstants.js
@@ -0,0 +1 @@
+export const marster_key = ""; //to be completed
\ No newline at end of file
diff --git a/model/class.js b/model/class.js
new file mode 100644
index 0000000..0d17ce1
--- /dev/null
+++ b/model/class.js
@@ -0,0 +1,23 @@
+const AV = require('../lib/av-live-query-weapp-min');
+
+class Class extends AV.Object{
+  get name(){
+    return this.get("name");
+  }
+  set name(value){
+    this.set("name", value);
+  }
+  get students(){
+    return this.get("students");
+  }
+  add_student(user){
+    this.addUnique("students", user.id);
+  }
+  del_student(user){
+    let students = this.get("students");
+    if(user.id in students){
+      this.remove(user.id);
+    }
+  }
+  
+}
\ No newline at end of file
diff --git a/model/presence.js b/model/presence.js
new file mode 100644
index 0000000..ac1b644
--- /dev/null
+++ b/model/presence.js
@@ -0,0 +1,16 @@
+const AV = require('../lib/av-live-query-weapp-min');
+
+class Presence extends AV.Object{
+  set user(value){
+    this.set("user", value);
+  }
+  get user(){
+    return this.get("user");
+  }
+  set class(value){
+    this.set("class", value);
+  }
+  get class(){
+    return this.get("class");
+  }
+}
\ No newline at end of file
diff --git a/model/user.js b/model/user.js
new file mode 100644
index 0000000..e69de29
diff --git a/pages/class.wxml b/pages/class.wxml
new file mode 100644
index 0000000..e69de29
diff --git a/pages/class.wxss b/pages/class.wxss
new file mode 100644
index 0000000..e69de29
diff --git a/pages/class/class.js b/pages/class/class.js
new file mode 100644
index 0000000..694d348
--- /dev/null
+++ b/pages/class/class.js
@@ -0,0 +1,66 @@
+// pages/class/class.js
+Page({
+
+  /**
+   * 页面的初始数据
+   */
+  data: {
+
+  },
+
+  /**
+   * 生命周期函数--监听页面加载
+   */
+  onLoad: function (options) {
+
+  },
+
+  /**
+   * 生命周期函数--监听页面初次渲染完成
+   */
+  onReady: function () {
+
+  },
+
+  /**
+   * 生命周期函数--监听页面显示
+   */
+  onShow: function () {
+
+  },
+
+  /**
+   * 生命周期函数--监听页面隐藏
+   */
+  onHide: function () {
+
+  },
+
+  /**
+   * 生命周期函数--监听页面卸载
+   */
+  onUnload: function () {
+
+  },
+
+  /**
+   * 页面相关事件处理函数--监听用户下拉动作
+   */
+  onPullDownRefresh: function () {
+
+  },
+
+  /**
+   * 页面上拉触底事件的处理函数
+   */
+  onReachBottom: function () {
+
+  },
+
+  /**
+   * 用户点击右上角分享
+   */
+  onShareAppMessage: function () {
+
+  }
+})
\ No newline at end of file
diff --git a/pages/class/class.json b/pages/class/class.json
new file mode 100644
index 0000000..8835af0
--- /dev/null
+++ b/pages/class/class.json
@@ -0,0 +1,3 @@
+{
+  "usingComponents": {}
+}
\ No newline at end of file
diff --git a/pages/class/class.wxml b/pages/class/class.wxml
new file mode 100644
index 0000000..2f7bc55
--- /dev/null
+++ b/pages/class/class.wxml
@@ -0,0 +1,3 @@
+<!--pages/class/class.wxml-->
+<text>pages/class/class.wxml
+界面待完成</text>
diff --git a/pages/class/class.wxss b/pages/class/class.wxss
new file mode 100644
index 0000000..3d5fb7d
--- /dev/null
+++ b/pages/class/class.wxss
@@ -0,0 +1 @@
+/* pages/class/class.wxss */
\ No newline at end of file
diff --git a/pages/index/index.js b/pages/index/index.js
index f1def29..3da9585 100644
--- a/pages/index/index.js
+++ b/pages/index/index.js
@@ -7,7 +7,8 @@ Page({
             { id: 'https', title: '实验一：HTTPS' },
             { id: 'session', title: '实验二：会话' },
             { id: 'websocket', title: '实验三：WebSocket' },
-            { id: 'game', title: '实验四：剪刀石头布小游戏' }
+            { id: 'game', title: '实验四：剪刀石头布小游戏' },
+            { id: "class", title: "进入教室"}
         ],
         done: lab.getFinishLabs()
     },
diff --git a/utils.js b/utils.js
new file mode 100644
index 0000000..e69de29
diff --git a/utils/userutils.js b/utils/userutils.js
new file mode 100644
index 0000000..e69de29
diff --git a/读我.txt b/读我.txt
index 9ebb734..904c984 100644
--- a/读我.txt
+++ b/读我.txt
@@ -1,11 +1,15 @@
-登录微信公众平台，前往 设置 > 开发设置 > 服务器配置 > 「修改」 链接，增加下述域名为白名单中的域名
+# 后台数据交互部分日志
+
+## 登录微信公众平台，前往 设置 > 开发设置 > 服务器配置 > 「修改」 链接，增加下述域名为白名单中的域名
+request合法域名
 fqcxn98z.api.lncldglobal.com
 fqcxn98z.engine.lncldglobal.com
 fqcxn98z.rtm.lncldglobal.com
 fqcxn98z.push.lncldglobal.com
 app-router.leancloud.cn
+socket合法域名
 us-w1-backend2.leancloud.cn
 us-w1-backend3.leancloud.cn
 us-w1-backend4.leancloud.cn
 us-w1-backend5.leancloud.cn
-us-w1-backend6.leancloud.cn
\ No newline at end of file
+us-w1-backend6.leancloud.cn