This is a timer method in which you specify both the interval of the callback and the function to call back.
这是一个定时器方法，同时指定了回调时间间隔和回调函数。
As you can see in order for the call to be a true tail-call, no other operation can be performed on the result of the tail-called function before it is passed back.
可见，要使调用成为真正的尾部调用，在尾部调用函数返回之前，对其结果不能执行任何其他操作。
When each of the other elements are parsed, you pop the Employee object off the stack, call the relevant set function, and push the object back on to the stack.
每当其他元素被解析时，您将这个Employee对象弹出Stack，调用相关的set函数，然后将该对象推回Stack。
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