ajax无刷新上传

form.php

    <input type="file" id="file" multiple="true"/>      <button onclick="upload()">upload</button>      <script>          function upload(){              var file = document.getElementById("file").files;              var formData = new FormData();              formData.append("file",file[0]);              var ajax = new XMLHttpRequest();              ajax.onreadystatechange=function()              {                  if(ajax.status==200 && ajax.readyState==4){                      console.log(ajax.responseText);                  }              }              ajax.open("post","xhr.php");              ajax.send(formData);          }      </script>  

xhr.php

<?php      $name=$_FILES['file']['name'];      move_uploaded_file($_FILES['file']['tmp_name'],iconv("UTF-8","gb2312",$name))