不刷新页面

<form action="upload" id="form2" enctype="multipart/form-data" method="post" target="hidden_iframe">
  <div style="display:none;">
    <input type="hidden" name="method" value="哈好端端" />
    <iframe name="hidden_iframe" id="hidden_iframe"></iframe>
  </div>
  <span style="position:absolute;" mce_style="position:absolute;display:none;" id="showUploadFile">
  <input type="file" id="uploadExcelFile" name="uploadExcelFile" style="width:200px;"  />
  <input type="submit" id="upload" value="upload"   />
  </span>
</form>