PHP+JavaScript实现无刷新上传图片

<!-- ajax文件上传开始 --><script type="text/javascript" src="/imageupload/jquery-1.10.2.min.js"></script><script type="text/javascript" src="/imageupload/layer/layer.js"></script><script type="text/javascript" src="/imageupload/ajaxupload.js"></script><!--ajax文件上传结束--><!--上传文件按钮列表开始--><input id="requesturl" type="hidden" value="{:U('admin/upload/uploadfile')}" /><input id="ajaxuploadfile" type="file" onchange="filechange()"/><input id="filepathurl" type="hidden" value="" /><input type="button" value="第一张" pathurl="./Uploads/admin/trailer/" class="uploadclass" /><input type="button" value="第二张" pathurl="./Uploads/admin/fdfdfd/" class="uploadclass" /><input type="button" value="第三张" pathurl="./Uploads/admin/cdcdfd/" class="uploadclass" /><!--上传文件按钮列表结束-->

/*** 文件上传方法*/public function uploadfile(){//单文件上传$upload = new /Think/Upload();// 实例化上传类$upload->maxSize = 100000000 ;// 设置附件上传大小$upload->exts = array('jpg', 'gif', 'png', 'jpeg');// 设置附件上传类型$url = $_POST['filepathurl'];if (!file_exists($url)){mkdir ($url,0777,true);}$upload->rootPath = $url; // 设置附件上传根目录// 上传单个文件$info = $upload->uploadOne($_FILES['postfilename']);if(!$info) {echo json_encode(array('bool'=>false,'error'=>$upload->getError()));}else{$path = $info['savepath'].$info['savename'];echo json_encode(array('bool'=>true,'path'=>$path));}}