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))