Javascript Assistance: I am having difficulty on trying to use the value-returning method, isVowel, that returns the value true if a given character...

Javascript Assistance: I am having difficulty on trying to use the value-returning method, isVowel, that returns the value true if a given character is a vowel, and otherwise returns false. With the second step of writing a program that prompts the user to input a sequence of characters and outputs the number of vowels.