Javascript 使用js与php自动上传PDF文件

我有这样的php代码

//this have loop for repeat data by $i
<tr>
  <th>Num:</th>
  <th>upload</th>
</tr>
<tr>
  <td><?php echo $i?></td>
  <td>
    <div id="me<?php echo $i ?>" num="<?php echo $i ?>" class="styleall me" ><span ><span class="glyphicon glyphicon-folder-open uploadChange"></span></span></div><span id="mestatus<?php echo $i ?>" class="mestatus" ></span>
    <div id="files<?php echo $i ?>" class="files">
        <li class="success">
        </li>
    </div>
  </td>
</tr> // end loop

//此循环用于按$i重复数据
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$('.uploadChange').click(function(event) {
    event.preventDefault();
    var num = $('.me').attr('num');
    var btnUpload = $('#me'+num);
    var mestatus = $('#mestatus' + num);
    var files = $('.files');
    new AjaxUpload(btnUpload, {
        action: '/uploadDoc.php',
        name: 'uploadfile',
        onSubmit: function(file, ext) {
            if (!(ext && /^(pdf)$/.test(ext))) {
                mestatus.text('PDF files are allowed');
                return false;
            }
            mestatus.html('<img src="/ajax-loader.gif" height="16" width="16">');
        },

        onComplete: function(file, response) {
            mestatus.text('File Uploaded Sucessfully!');
            files.html('');
        }
    });
});

new AjaxUpload(btnUpload, {
        action: '/uploadDoc.php',
        name: 'uploadfile',
        onSubmit: function(file, ext) {
            if (!(ext && /^(pdf)$/.test(ext))) {
                mestatus.text('PDF files are allowed');
                return false;
            }
            mestatus.html('<img src="/ajax-loader.gif" height="16" width="16">');
        },

        onComplete: function(file, response) {
            mestatus.text('File Uploaded Sucessfully!');
            files.html('');
        }
 });