如何合并受约束的数组中的连续元素？

function mergeConsecutiveElements(arr) {
  if (arr.length === 0) {
    return [];
  }
  
  let result = [arr[0]];
  let currentSequence = [arr[0]];
  
  for (let i = 1; i < arr.length; i++) {
    if (arr[i] === currentSequence[currentSequence.length - 1] + 1) {
      currentSequence.push(arr[i]);
    } else {
      result.push(currentSequence);
      currentSequence = [arr[i]];
    }
  }
  
  result.push(currentSequence);
  
  return result;
}

// 示例用法
const arr = [1, 2, 3, 5, 6, 8, 9, 10, 12];
const mergedArr = mergeConsecutiveElements(arr);
console.log(mergedArr); // 输出：[[1, 2, 3], [5, 6], [8, 9, 10], [12]]