不能在Node.Js中的不同文件中调用Mongoose函数

npm install mongoose

const mongoose = require('mongoose');

const mongoose = require('mongoose');

const connectDB = async () => {
  try {
    await mongoose.connect('mongodb://localhost/mydatabase', {
      useNewUrlParser: true,
      useUnifiedTopology: true,
    });
    console.log('Connected to MongoDB');
  } catch (error) {
    console.error('Failed to connect to MongoDB', error);
  }
};

module.exports = connectDB;

const mongoose = require('mongoose');

const userSchema = new mongoose.Schema({
  name: String,
  email: String,
});

const User = mongoose.model('User', userSchema);

module.exports = User;

const User = require('./User');

const createUser = async (userData) => {
  try {
    const user = new User(userData);
    await user.save();
    console.log('User created successfully');
  } catch (error) {
    console.error('Failed to create user', error);
  }
};

createUser({ name: 'John Doe', email: 'johndoe@example.com' });