Java script

Write a JavaScript function called countOccurs which takes a string, str, as a parameter, and returns an object that contains the number of times that each unique character occurs. For example, the following string: "Cat in the hat" Should return the following object: { . : 3, "C': 1, 'a': 2, 'e': 1, "h: 2, 'i': 1, 'n': 1, 't': 3, }