如何使字符串排序程序不区分大小写？

function caseInsensitiveSort(strList) {
  // 自定义的不区分大小写比较函数
  function compareIgnoreCase(str1, str2) {
    const lowerStr1 = str1.toLowerCase();
    const lowerStr2 = str2.toLowerCase();
    if (lowerStr1 < lowerStr2) {
      return -1;
    } else if (lowerStr1 > lowerStr2) {
      return 1;
    } else {
      return 0;
    }
  }

  // 使用快速排序算法进行排序
  function quickSort(arr, left, right) {
    if (left < right) {
      const pivotIndex = partition(arr, left, right);
      quickSort(arr, left, pivotIndex - 1);
      quickSort(arr, pivotIndex + 1, right);
    }
  }

  function partition(arr, left, right) {
    const pivot = arr[right];
    let i = left - 1;
    for (let j = left; j < right; j++) {
      if (compareIgnoreCase(arr[j], pivot) <= 0) {
        i++;
        swap(arr, i, j);
      }
    }
    swap(arr, i + 1, right);
    return i + 1;
  }

  function swap(arr, i, j) {
    const temp = arr[i];
    arr[i] = arr[j];
    arr[j] = temp;
  }

  // 复制原始字符串列表，避免修改原始数据
  const sortedList = [...strList];
  quickSort(sortedList, 0, sortedList.length - 1);
  return sortedList;
}

// 示例用法
const strings = ["apple", "Banana", "cherry", "Date"];
const sortedStrings = caseInsensitiveSort(strings);
console.log(sortedStrings);