jquery ajaxupload无刷新文件上传文件

<script type="text/javascript">

    $(function () {
        var button = $('#upload');
        new AjaxUpload(button, {
            action: '/upload/imagesAjaxUpload',
            name: 'upload',
            onSubmit: function (file, ext) {
                if (!(ext && /^(jpg|jpeg|JPG|JPEG)$/.test(ext))) {
                    alert('图片格式不正确,请选择 jpg 格式的文件!', '系统提示');
                    return false;
                }

                // change button text, when user selects file
                button.text('上传中');

                // If you want to allow uploading only 1 file at time,
                // you can disable upload button
                this.disable();

                // Uploding -> Uploading. -> Uploading...
                interval = window.setInterval(function () {
                    var text = button.text();
                    if (text.length < 10) {
                        button.text(text + '...');
                    } else {
                        button.text('上传中');
                    }
                }, 200);
            },
            onComplete: function (file, response) {
                window.clearInterval(interval);
  
                // enable upload button
                this.enable();
  var json = eval('(' + response + ')');
  button.text('选择文件');
  $(".qr").css("display","inline");
  $(".qr>img").attr("src",json.file_name);
  $("input[name='wechat_qr']").val('/uploads/qr/'+json.file_name);
  //alert(json.file_name);
  //$("#ajaximg").html("<img src='/uploads/qr/"+json.file_name+"' />");
  //$("#wechat_qr").val('/uploads/qr/'+json.file_name);
            }
        });

    });
</script>