jQuery ajax上传文件

<script>
  var formData = new FormData();
  const date = $("#datepicker2").val();
  formData.append("date", date);
  formData.append("file", $("#upload")[0].files[0]);
  $.ajax({
    url: url,
    type: "post",
    cache: false,
    data: formData,
    processData: false,
    contentType: false,
    success: function (msg) {},
    beforeSend: function () {},
    error: function () {},
  });
</script>