在AJAX上传文件时，在完成上传过程之前不应刷新页面，因为它会中断上传并导致失败。应该使用AJAX轮询技术来检查上传的进度，以便在上传完成后自动刷新页面或回调函数来通知用户。

以下是基于jQuery框架的示例代码：

function sendFile() {
   var formData = new FormData($("#fileForm")[0]);
   $.ajax({
      url: "upload.php",
      type: "POST",
      data: formData,
      processData: false,
      contentType: false,
      success: function(response) {
         // Handle success response
      },
      xhr: function() {
         var xhr = new window.XMLHttpRequest();
         xhr.upload.addEventListener("progress", function(evt) {
            if (evt.lengthComputable) {
               var percentComplete = evt.loaded / evt.total;
               // Update progress bar or inform user of progress
            }
         }, false);
         return xhr;
      }
   });
   setInterval(function() {
      $.ajax({
         url: "check_upload_progress.php",
         type: "GET",
         success: function(response) {
            if (response == "complete") {
               location.reload(); // Reload page when upload is complete
            }
         }
      });
   }, 5000); // Poll for upload progress every 5 seconds
}