JavaScript Calculator: The web page should have two input fields and a radio button group for the operation, with the 4 basic math operations represented (add, subtract, multiply, divide). JavaScript should monitor all three fields and display the current result whenever the user changes any value in any field, without refreshing the page. Tip 1: Consider using either the change or the keyup event on the text fields, and either the change or the click event on the radio buttons. The calculator should be completely self-contained; i.e., you should not be making any requests to any other server-side or client-side scripts or web pages after the initial page load.