php无刷新上传图片

<!--图片上传begin-->
<script type="text/javascript" src="/js/jquery.form.js"></script>
<script type="text/javascript" src="/js/uploadImg.js"></script>
<link href="/css/uploadImg.css" rel="stylesheet" type="text/css" />
<!--图片上传end-->

<div class="upimg">
              <input name="icon" type="text" class="imgsrc" value="<!--{$contents.icon}-->" />
              <div class="showimg">
                <!--{if $contents.icon}-->
                <img src="<!--{$contents.icon}-->" height="120px">
                <!--{/if}-->
              </div>                   
              <div class="btn" style="height:20px;">
                   <span>添加图片</span>
                   <input class="fileupload" type="file" name="pic[]">
              </div>
              </div> 

/*图片上传*/
    $(".fileupload").wrap("<form action='/bookstore/book/uploadpic' method='post' enctype='multipart/form-data'></form>"); //函数处理

jQuery(function ($) { 
    $(".fileupload").change(function(){ //选择文件 
        if ('' === $(this).val()) return;
        var upimg = $(this).parent().parent().parent();
        var showimg = upimg.find('.showimg');
        var btn = upimg.find('.btn span');
        var imgsrc =  upimg.find('.imgsrc');
        $(this).parent().ajaxSubmit({ 
            //dataType:  'json', //数据格式为json 
            beforeSend: function() { //开始上传 
                showimg.empty(); //清空显示的图片 
                imgsrc.val("");
                btn.html("上传中..."); //上传按钮显示上传中 
            }, 
            uploadProgress: function(event, position, total, percentComplete) { 
            }, 
            success: function(data) { //成功 
                //获得后台返回的json数据，显示文件名，大小，以及删除按钮 
                var img = data;
                //显示上传后的图片 
                imgsrc.val("");
                imgsrc.val(img);
                showimg.html("<img width='120' height='120' src='"+img+"'>"); 
                btn.html("上传成功"); //上传按钮还原 
            }, 
            error:function(xhr){ //上传失败 
                btn.html("上传失败"); 
            } 
        }); 
    }); 
}); 

public function uploadpicAction(){ //图片上传和显示
        $data = "";
        $src = $this->uploadFiles2($imgpath = "/upload/book" ,$filesname = "pic");            
        isset($src[0]['src']) && $src[0]['src'] ? $data = $this->concaturl($src[0]['src']) : null;
        echo $data; 
    }