计算列表数组中特定元素的总出现次数

function countOccurrences(arr, target) {
  let count = 0;
  for (let i = 0; i < arr.length; i++) {
    if (arr[i] === target) {
      count++;
    }
  }
  return count;
}

const arr = [1, 2, 3, 4, 2, 2, 3, 1, 2];
const target = 2;
const occurrences = countOccurrences(arr, target);
console.log(`元素 ${target} 在数组中出现的次数为 ${occurrences} 次。`);