如何为多个方法注册相同的mongoose钩子？

const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/mydatabase', { useNewUrlParser: true });

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

userSchema.pre('save', function(next) {
  // 钩子逻辑
  console.log('Before saving user...');
  next();
});

userSchema.pre('remove', function(next) {
  // 钩子逻辑
  console.log('Before removing user...');
  next();
});

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

const newUser = new User({
  name: 'John Doe',
  email: 'johndoe@example.com'
});

newUser.save(function(err) {
  if (err) {
    console.error(err);
  } else {
    console.log('User saved successfully');
  }
});

User.findOne({ name: 'John Doe' }, function(err, user) {
  if (err) {
    console.error(err);
  } else if (user) {
    user.remove(function(err) {
      if (err) {
        console.error(err);
      } else {
        console.log('User removed successfully');
      }
    });
  }
});