从第三个字节开始因此

const msg = "0F04ABABABAB";
const msg1 = "0F04ABABABAB10001FF";
function solution(msg, tags) {
  const tagObj = {};
  for (let i = 0; i + 3 < msg.length; ) {
    const tag = parseInt(msg.slice(i, i + 2), 16);
    const len = parseInt(msg.slice(i + 2, i + 4), 16);
    const valueOffset = Math.floor((i + 5) / 2);
    console.log(tag);
    console.log(len);
    console.log(valueOffset);

    i = i + 3 + len * 2;
    // 如果结束位置越界则报文不完整，需要舍弃
    if (i >= msg.length) break;
    tagObj[tag] = [len, valueOffset];
  }

  const res = tags.map((tag) => {
    if (tagObj[tag]) {
      const [len, valueOffset] = tagObj[tag];
      return `${len} ${valueOffset}`;
    } else {
      return `0 0`;
    }
  });
  return res.join("\n");
}

console.log(solution(msg, [15]));
/* 
0F04ABABABAB
1
15
=>
4 2

0F04ABABABAB10001FF
2
15
17
=>
4 2
0 0
 */