diff --git a/3.0 app.js b/3.0 app.js
new file mode 100644
index 0000000..2f0982a
--- /dev/null
+++ b/3.0 app.js	
@@ -0,0 +1,13 @@
+App({
+  onLaunch: function () {
+    // 初始化云开发
+    wx.cloud.init({
+      env: 'rollcall-7gk1ko7v5ea7b3c1' // 替换为你的云开发环境ID
+    });
+
+    // 初始化全局数据
+    this.globalData = {
+      students: []
+    };
+  }
+});
\ No newline at end of file