如何将字符串拆分为单词.例如:"stringintowords" - >"String into Words"？

function splitStringToWords(str) {
  let words = [];
  let currentWord = "";

  for (let i = 0; i < str.length; i++) {
    if (str[i] === str[i].toUpperCase()) {
      if (currentWord !== "") {
        words.push(currentWord);
        currentWord = "";
      }
    }
    currentWord += str[i];
  }

  if (currentWord !== "") {
    words.push(currentWord);
  }

  return words.join(" ");
}

const inputString = "stringintowords";
const result = splitStringToWords(inputString);
console.log(result); // Output: "String into Words"