如何使用JavaScript大写句子的第一个字符？

function capitalizeFirstLetter(sentence) {
  var trimmedSentence = sentence.trim();
  var firstChar = trimmedSentence.charAt(0);
  var capitalizedFirstChar = firstChar.toUpperCase();
  var remainingChars = trimmedSentence.slice(1);
  
  return capitalizedFirstChar.concat(remainingChars);
}

var sentence = "hello world";
var capitalizedSentence = capitalizeFirstLetter(sentence);
console.log(capitalizedSentence); // Output: "Hello world"