如何在asp.net中一键下载html文件？

<button onclick="downloadHtml()">下载HTML文件</button>

function downloadHtml() {
  var xhr = new XMLHttpRequest();
  xhr.open("GET", "path/to/your/html/file.html", true);
  xhr.responseType = "blob";

  xhr.onload = function () {
    if (xhr.status === 200) {
      var blob = new Blob([xhr.response], { type: "text/html" });
      var url = window.URL.createObjectURL(blob);
      var a = document.createElement("a");
      a.href = url;
      a.download = "file.html";
      a.click();
      window.URL.revokeObjectURL(url);
    }
  };

  xhr.send();
}

protected void Page_Load(object sender, EventArgs e)
{
    if (Request.QueryString["download"] == "html")
    {
        string filePath = Server.MapPath("~/path/to/your/html/file.html");
        string fileName = "file.html";

        Response.Clear();
        Response.ContentType = "text/html";
        Response.AddHeader("Content-Disposition", "attachment; filename=" + fileName);
        Response.WriteFile(filePath);
        Response.End();
    }
}