如何从file对象本地保存pdf文件？

function savePDF(file) {
  const reader = new FileReader();
  reader.onload = function(event) {
    const data = event.target.result;
    const blob = new Blob([data], { type: 'application/pdf' });
    const url = URL.createObjectURL(blob);
    
    const a = document.createElement('a');
    a.href = url;
    a.download = file.name;
    document.body.appendChild(a);
    
    a.click();
    document.body.removeChild(a);
    URL.revokeObjectURL(url);
  };
  reader.readAsArrayBuffer(file);
}

// 调用示例
const fileInput = document.getElementById('file-input');
fileInput.addEventListener('change', function(event) {
  const file = event.target.files[0];
  savePDF(file);
});