如何从数组中找到精确的(最小)元素以匹配给定的和

function findExactMatch(arr, targetSum) {
  let diffArray = [];
  let minDiff = Infinity;
  let minDiffIndex = -1;

  // 计算每个元素与给定和的差值
  for (let i = 0; i < arr.length; i++) {
    let diff = Math.abs(arr[i] - targetSum);
    diffArray.push(diff);

    // 更新最小差值和对应的索引
    if (diff < minDiff) {
      minDiff = diff;
      minDiffIndex = i;
    }
  }

  // 返回精确匹配的最小元素
  return arr[minDiffIndex];
}

// 示例用法
let array = [2, 4, 6, 8, 10];
let target = 7;
let result = findExactMatch(array, target);
console.log(result); // 输出 6