tophat_totalscore.js

var findScores = function() { 
  return Array.from(document.querySelectorAll('span[class^=StudentPointsLabel]'))
              .map(i => i.textContent)
              .filter(i => i !== "" && i !== "1/1" && i !== "0/1")
              .map(i => i.split('/').map(i => parseFloat(i)))
              .reduce((a, i) => {a[0] += i[0]; a[1] += i[1]; return a}, [0, 0]);
}

var alertScores = function() {
  let scores = findScores();
  alert(`Your score is ${scores[0]} / ${scores[1]} (${scores[0] / scores[1] * 100}%)`);
}