取数组中每2个数据点的平均值，创建一个新的数组

function calculateAverages(arr) {
  let averages = [];
  for (let i = 0; i < arr.length - 1; i += 2) {
    let avg = (arr[i] + arr[i + 1]) / 2;
    averages.push(avg);
  }
  return averages;
}

// 示例数组
let numbers = [1, 2, 3, 4, 5, 6];
let averagesArray = calculateAverages(numbers);
console.log(averagesArray); // 输出: [1.5, 3.5, 5.5]

function calculateAverages(arr) {
  let averages = [];
  for (let i = 0; i < arr.length - 1; i += 2) {
    let avg = (arr[i] + arr[i + 1]) / 2;
    averages.push(avg);
  }
  // 处理奇数长度数组的最后一个元素
  if (arr.length % 2 !== 0) {
    averages.push(arr[arr.length - 1]);
  }
  return averages;
}

// 示例数组
let numbers = [1, 2, 3, 4, 5];
let averagesArray = calculateAverages(numbers);
console.log(averagesArray); // 输出: [1.5, 3.5, 5]