在两个JavaScript数组中查找元素，并使用自己的不同数组存储每个数组

I have a list of contacts from two arrays. Some of the elements maybe the same, but I need to know which array has unique values and keep those unique values in that array. In other words, I want to track the unique values from which array they came from. This is my spaghetti code that I have so far:I have a list of contacts from two arrays. Some