我没有使用ajax php获取excel文件上传的临时名称

Question

我想得到临时名称excel上传使用php，jquery ajax.My代码如下。但我没有得到任何价值。这个要求是上传excel文件显示在框中。任何身体给这些解决方案问题？吨\

main.php

   <div class="form-group">
    <label for="exampleInputFile">File Upload</label>
    <input type="file" name="file" id="file" size="150">
    <p class="help-block">Only Excel/CSV File Import.</p>
    </div>
    <button type="button" class="btn btn-default"
    name="Import" value="Import" onclick="file_up()">
    Upload</button>
    <div id="upload_show" >   </div>

     <script src="//code.jquery.com/jquery-1.11.0.min.js"></script>

     <script type="text/javascript">
     function file_up()
     {
      var file=$('#file').val();
      $.ajax({
      type: "POST",
      url: 'first_ajax.php',
       data:'file='+file,
       success: function(msg)
      { 
         $("#upload_show").html(msg);
        }
     });
     }
   </script>


 first_ajax.php

    < ?php
     echo $file1=$_POST['file']['tmp_name'];
   ?>

     $filename= $file1
   $file = fopen($filename, "r");

    $count = 0;?>
    <ul id="my-list">

    <?php  
     while (($emapData = fgetcsv($file, 10000, ",")) !== FALSE)
     {



        $count++;  
        if($count>1)
          {
          ?>

             <li> <table  style="border-color:#3300FF;
               border:solid #999999; width:100px; ">
                 <tr> <td>Name </td> <td> Email</td></tr>
              <tr> <td><?php echo $emapData[0]; ?> </td> 
             <td> <?php echo $emapData[1]; ?></td></tr></table>

              </li>
          <?php   
        }   

         }?>

        </ul>
        <?php

       fclose($file);


      ?>