document.addEventListener('DOMContentLoaded', function(){    (function(){        let sr = document.querySelectorAll('.my-star');        let i = 0;        //loop through stars        while (i < sr.length){            //attach click event            sr[i].addEventListener('click', function(){                //current star                let cs = parseInt(this.getAttribute("data-star"));                //output current clicked star value                document.querySelector('#output').value = cs;            })//end of click event            i++;        }//end of while loop    })();//end of function})