在JavaScript中使用querySelector，但不适用于HTML

Question

我正在从事《 Hangman》游戏，但是我的HTML页面上没有出现猜错的字母。

在JavaScript中，我有：

//Array of available words
const words = ["patriots", "bills", "dolphins", "jets", "chiefs", "chargers", "raiders", "broncos", "steelers", "ravens", "bengals", "browns", "jaguars", "titans", "colts", "texans", "eagles", "cowboys", "redskins", "giants", "rams", "seahawks", "cardinals", "niners", "vikings", "lions", "packers", "bears", "saints", "panthers", "falcons", "buccaneers"];

let currentWord;
let dashes = [];
let rightLetter = [];
let wrongLetter = [];

//Computer chooses a random word from the words array. The random choice becomes currentWord
function startGame() {
  currentWord = words[Math.floor(Math.random() * words.length)];

  //test
  console.log(currentWord)

  //Creates underscores depending on length of the currentWord; push underscores to dashes array 
  for (let i = 0; i < currentWord.length; i++) {
    dashes.push(' _ ');
  }
  return dashes;

  let formattedDashes = dashes.join(' ');
  document.getElementByClassName('dashContainer').innerHTML = formattedDashes;
}

//test
console.log(startGame());

//HTML document waits for key to be pressed; key is assiged Unicode value (a/A are diff)
document.addEventListener('keypress', (event) => {
  let codes = event.keyCode;

  //Convert a Unicode value into a character
  let characters = String.fromCharCode(codes);

  //Search currentWord for the users correct guess; push character to rightLetter array
  if (currentWord.indexOf(characters) > -1)
    rightLetter.push(characters);

  //Replace dashes with correctly choosen characters
  dashes[currentWord.indexOf(characters)] = characters;
  console.log(dashes);



  //Search currentWord for the users incorrect guess; push character to wrongLetter array
  if (currentWord.indexOf(characters) < 0)
    wrongLetter.push(characters);
  //Test        
  console.log(wrongLetter);
})

//Start game function
//startGame()


//Test Example
document.getElementById("start").addEventListener("click", function () {
  alert("Good Luck!")


  document.querySelector(".wrong").innerHTML = wrongLetter;

})

wrongLetter是一个空数组，字母显示在console.log中。我的HTML页面上有

<div class="wrong"></div>

console.log中也没有错误。为什么这可能行不通的任何想法？

谢谢