是否可以仅使用JavaScript(客户端方法)在浏览器中为已识别的MIME类型启动下载提示？

function downloadFile(content, fileName, mimeType) {
  const blob = new Blob([content], { type: mimeType });
  const url = URL.createObjectURL(blob);
  const link = document.createElement("a");
  link.href = url;
  link.download = fileName;
  link.click();
  setTimeout(() => {
    URL.revokeObjectURL(url);
    link.remove();
  }, 100);
}

// 示例用法
downloadFile("Hello, world!", "hello.txt", "text/plain");