Create a JavaScript function that meets the following requirements:

Accepts a string parameter, counting the number of vowels within the string.

The function should be case insensitive, handling both upper and/or lowercase letters.

Displays the result to the console as illustrated below.

************** STEP 9 **************

Calling _nine(flugelhorn);

Vowel count: A=0, E=1, I=0, O=1, U=1, Y=0