JS如何度量FormData对象的大小？

function calculateFormDataSize(formData) {
  let size = 0;
  for (let pair of formData.entries()) {
    const key = pair[0];
    const value = pair[1];
    const keyBytes = new TextEncoder().encode(key).length;
    const valueBytes = new TextEncoder().encode(value).length;
    size += keyBytes + valueBytes;
  }
  return size;
}

// 示例用法
const formData = new FormData();
formData.append('name', 'John Doe');
formData.append('age', '25');
const dataSize = calculateFormDataSize(formData);
console.log(`FormData对象的大小为 ${dataSize} 字节`);