/*
  controllers
*/
const updateStudent = (req, res) => {
  // Validate Request
  if (!req.body.email) {
    return res.status(400).send({
      message: "This student is not enrolled",
    });
  }
  Student.findByIdAndUpdate(
      req.params.id, {
        $set: req.body,
      }, {
        new: true
      }
    )
    .then((student) => {
      if (!student) {
        return res.status(404).send({
          message: "Student not found with Student ID " + req.params.studentId,
        });
      }
      res.send(student);
    })
    .catch((err) => {
      if (err.kind === "ObjectId") {
        return res.status(404).send({
          message: "Student not found with Student ID " + req.params.studentId,
        });
      }
      return res.status(500).send({
        message: "Error updating note with Student ID " + req.params.studentId,
      });
    });
};

const deleteStudent = (req, res) => {
  Student.findByIdAndRemove(req.params.id, function(err) {
    if (err) return next(err);
    res.send("Deleted successfully!");
  });
};

/*
  routes
*/

router.put("/students/:id", updateStudent);
router.delete("/students/:id", deleteStudent);

回答如下：

请将获取方法更改为大写，这可能适合您。方法：“删除”，应替换为方法：“删除”，放置也应相同。