如何计算for中数字的个数

function countNumbersInForLoop(arr) {
  let count = 0;
  for (let i = 0; i < arr.length; i++) {
    if (typeof arr[i] === 'number') {
      count++;
    }
  }
  return count;
}

const numbers = [1, '2', 3, 'four', 5];
const result = countNumbersInForLoop(numbers);
console.log(result); // 输出：3