diff --git a/classManager.js b/classManager.js
index 1a3ef65..c331a51 100644
--- a/classManager.js
+++ b/classManager.js
@@ -1,48 +1,48 @@
-const fs = require('fs');
-const path = require('path');
-const xlsx = require('xlsx');
-const pool = require('../db');
-
-const classManager = {
-    addClass: (req, res) => {
-        const filePath = req.file.path;
-
-        // 读取并解析Excel文件
-        const workbook = xlsx.readFile(filePath);
-        const sheetName = workbook.SheetNames[0];
-        const worksheet = workbook.Sheets[sheetName];
-
-        const students = xlsx.utils.sheet_to_json(worksheet);
-
-        // 定义所需的字段
-        const requiredFields = [ 'student_id', 'student_name'];
-        let hasError = false;
-
-        students.forEach(student => {
-            // 数据验证
-            const missingFields = requiredFields.filter(field =>!(field in student));
-            if (missingFields.length > 0) {
-                console.error(`Student data is missing fields: ${missingFields.join(', ')}`);
-                hasError = true;
-                return;
-            }
-
-            // 将学生数据插入数据库
-            const query = 'INSERT INTO students (student_id, student_name, score, call_count) VALUES (?,?, 0, 0)';
-            pool.query(query, [student.student_id, student.student_name], (error) => {
-                if (error) {
-                    console.error(`Error inserting student: ${student.name}`, error);
-                    hasError = true;
-                }
-            });
-        });
-
-        if (hasError) {
-            res.status(500).json({ message: 'Error adding class. Some students were not added successfully.' });
-        } else {
-            res.status(200).json({ message: 'Class added successfully!' });
-        }
-    }
-};
-
-module.exports = classManager;
+const fs = require('fs');
+const path = require('path');
+const xlsx = require('xlsx');
+const pool = require('../db');
+
+const classManager = {
+    addClass: (req, res) => {
+        const filePath = req.file.path;
+
+        // 读取并解析Excel文件
+        const workbook = xlsx.readFile(filePath);
+        const sheetName = workbook.SheetNames[0];
+        const worksheet = workbook.Sheets[sheetName];
+
+        const students = xlsx.utils.sheet_to_json(worksheet);
+
+        // 定义所需的字段
+        const requiredFields = [ 'student_id', 'student_name'];
+        let hasError = false;
+
+        students.forEach(student => {
+            // 数据验证
+            const missingFields = requiredFields.filter(field =>!(field in student));
+            if (missingFields.length > 0) {
+                console.error(`Student data is missing fields: ${missingFields.join(', ')}`);
+                hasError = true;
+                return;
+            }
+
+            // 将学生数据插入数据库
+            const query = 'INSERT INTO students (student_id, student_name, score, call_count) VALUES (?,?, 0, 0)';
+            pool.query(query, [student.student_id, student.student_name], (error) => {
+                if (error) {
+                    console.error(`Error inserting student: ${student.name}`, error);
+                    hasError = true;
+                }
+            });
+        });
+
+        if (hasError) {
+            res.status(500).json({ message: 'Error adding class. Some students were not added successfully.' });
+        } else {
+            res.status(200).json({ message: 'Class added successfully!' });
+        }
+    }
+};
+
+module.exports = classManager;