Get the employee id from the request using params.id.
使用params . id从request中获得员工。
For example, an employee table contains employee ID and employee information.
例如,employee表包含雇员ID和雇员信息。
We’ll store our same Person objects as the values and use an employee id as the key.
我们把同样的Person 对象作为值,员工ID 作为键。