匹配单词串并返回不匹配的单词

function findUnmatchedWords(targetWords, referenceWords) {
  targetWords = targetWords.toLowerCase();
  referenceWords = referenceWords.toLowerCase();

  const targetWordArray = targetWords.split(" ");
  const referenceWordArray = referenceWords.split(" ");

  const unmatchedWords = [];

  for (let i = 0; i < targetWordArray.length; i++) {
    if (!referenceWordArray.includes(targetWordArray[i])) {
      unmatchedWords.push(targetWordArray[i]);
    }
  }

  return unmatchedWords;
}

const targetWords = "apple banana orange";
const referenceWords = "banana grapefruit pear";

const unmatchedWords = findUnmatchedWords(targetWords, referenceWords);
console.log(unmatchedWords);