陷入.change中的循环 - 选择2下拉列表

I have 2 drop down lists. One for people and one for businesses. If you select a person from the list it will automatically query the database and then select the correct corresponding business that is associated with that person. If you select a business, it will automatically query the database for all the people that are associated with that company. Then it clears the current list of people and appends the associated people.I have 2 drop down lists. One for people and on