My quiz (feedback)

var crown;
var correctAnswer = false;
var score = 0;

 //Questions for user

var userAnswer1 = prompt("How many weeks in the year?");
  if ( userAnswer1 === '52' || userAnswer1.toUpperCase() === 'FIFTYTWO' ) {
      correctAnswer = true;
      alert("It's correct!");
      score += 1; 
  } else {
      alert("Sorry, you are wrong! The correct answer was '52'");
      score += 0;
  }
var userAnswer2 = prompt(" Which has the highest mountain: Earth or Mars?");
  if ( userAnswer2.toUpperCase() === 'MARS' ) {
      correctAnswer === true;
      alert("It's correct!");
      score += 1; 
  }  else {
      alert("Sorry, you are wrong! The correct answer was 'Mars'");
      score += 0;
  }
var userAnswer3 = prompt("How many men have walked on the moon: 4, 8, or 12?");
  if ( userAnswer3 === '12' || userAnswer3.toUpperCase() === 'TWELVE' ) {
      correctAnswer === true;
      alert("It's correct!");
      score += 1; 
  }  else {
      alert("Sorry, you are wrong! The correct answer was '12'");
      score += 0;
  }
var userAnswer4 = prompt("Which word does the 'e' in 'e-mail' stand for?");
  if ( userAnswer4.toUpperCase() === 'ELECTRONIC' ) {
    correctAnswer === true;
      alert("It's correct!");
      score += 1;  
  }  else {
      alert("Sorry, you are wrong! The correct answer was 'electronic'");
      score += 0;
  }
var userAnswer5 = prompt("In which country is the world's largest McDonalds Restaurant?");
  if ( userAnswer5.toUpperCase() === 'CHINA' ) {
      correctAnswer === true;
      alert("It's correct!");
      score += 1; 
  }  else {
      alert("Sorry, you are wrong! The correct answer was 'China'");  
      score += 0;
  }

// Gives user gold, silver, bronze or no crown, depends on user's score

if ( score === 5 ) {
    crown = 'GOLD crown';
    alert("Wow! Congratulations, you've answered ALL the questions correctly!");
} else if ( score === 4 || score === 3) {
    crown = 'SILVER crown';       
} else if ( score === 2 || score === 1) {
    crown = 'BRONZE crown';
} else  {
    crown = 'NO crown';
    alert("Oops! Don't be sad and try again!");
}

// Prints results of the quiz

document.write("<h2> Here are your results! You have " + score + " correct answers.</h2>");
document.write("<h2> You've got a " + crown + "!</h2>");