functionExercise

function solve(){

   let tBody = document.querySelector('tbody');
   let items = tBody.querySelectorAll('tr');

   tBody.addEventListener('click', onClick);


       function onClick(e){

         let tr = e.target.parentNode;

         if(tr.nodeName === 'TR'){

            if(tr.style.backgroundColor !== ""){
               tr.style.backgroundColor = "";

            }else{
               [...items].forEach(i => i.style.backgroundColor = '');
               tr.style.backgroundColor = '#413f5e';
            }
         }

       }
}