PHP应用<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css"><script src="http://apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js"></script><script src="http://malsup.github.com/jquery.form.js"></script>

PHP应用<script type="text/javascript">$(function () {   $("#myupload").ajaxForm({     dataType:'json',     beforeSend:function(){          $(".progress").show();     },     uploadProgress:function(event,position,total,percentComplete){         var percentVal = percentComplete + '%';         $(".progress-bar").width(percentComplete + '%');         $(".progress-bar").html(percentVal);         $(".sr-only").html(percentComplete + '%');     },     success:function(data){         $(".progress").hide();               if(data.error == "empty_name"){             alert("文件上传非法,上传失败!");             exit();         };         if(data.error == "large"){             alert("图片上传不能大于2M,上传失败!");             exit();         };   /*alert(data.error);*/         if(data.error == "format"){             alert("图片格式错误,上传失败");             //alert(data.type);             exit();         };           //alert("上传成功!");         //files.html("<b>"+data.name+"("+data.size+"k)</b> <span class='delimg' rel='"+data.pic+"'>删除</span>");         $(".files").html("文件名: "+data.name+"<span class='delimg' rel='"+data.pic+"'>  del  </span>大小："+data.size);         var img = "http://www.sandleft.com/test/input/upload/files/"+data.pic;         $(".showimg").html("<img src='"+img+"'>");         alert("上传成功!");     },     error:function(){         alert("图片上传失败");     }         });   $(".progress").hide();}); </script>

PHP应用<div class="uk-container uk-container-center">         <div class="pk-system-messages"></div>         <h1 class="uk-h2 uk-text-center" style="margin-top:-100px;">文件上传</h1>        <div class="pk-system-messages"></div>          <div class="container-main">          <h1>Ajax Image Uploader</h1>          <p>A simple tutorial to explain image uploading using jquery ajax and php</p>             <form id='myupload' action='new_upload.php' method='post' enctype='multipart/form-data'>            <label for="file">Filename:</label>           <input type="file" name="mypic" id="file"><br>           <input type="submit" name="upload" class="btn btn-success" value="upload">          </form>              <div class="progress">             <div class="progress-bar progress-bar-success progress-bar-striped" role="progressbar" aria-valuenow="45" aria-valuemin="0" aria-valuemax="100" style="width: 0%">              <span class="sr-only">0% Complete</span>           </div>           </div>          <div class="files"></div>          <div class="showimg"></div>         </div>                </div>

PHP应用<?phpclass upload{   protected $file_path = "files"; //当前files存储文件夹  #protected $file_size = 1024000;  protected $file_size = 5120000; //5M 用户上传  //检测文件是否为空 public function check_file($get_file) {    if (empty($get_file))    {     $type = "check_file";       $arr = array('error'=>'empty_name','type'=>$type);       echo json_encode($arr);       exit();    }  return true;}   //检测文件类型 public function check_type($get_type) {   if (( $get_type == ".docx" ) || ( $get_type == ".doc" )) {      #$types = $get_type;   }else{      $type = "check_type";      $arr = array('error'=>'format','type'=>$type);        echo json_encode($arr);        exit();     }  return true; }  //检测文件大小 public function check_size($get_file) {   if ( $get_file != "" ) {      if ( $get_file > $this->file_size ) {          $arr = array('error'=>'large');          echo json_encode($arr);          exit();      }  }else{    return false;    exit();  } return true; }  //文件保存 public function save_file($file_type,$file_tmp_name) {  $rand = rand(1000, 9999);  $pics = date("YmdHis") . $rand . $file_type;  $path = $this->file_path."/".$pics;  $result = move_uploaded_file($file_tmp_name, $path);  if($result){    return $pics;  }else{    return false;    exit();  }  #return $pics; } }PHP文件上传处理<?phpinclude("upload.class.php");$up_obj = new upload(); $get_fileName = $_FILES['mypic']['name'];$get_fileSize = $_FILES['mypic']['size'];$get_TmpFiles = $_FILES['mypic']['tmp_name']; $get_fileType = strstr($get_fileName, '.'); $check_result = $up_obj->check_file($get_fileName); if($check_result){   //检查文件类型  $result_type = $up_obj->check_type($get_fileType);   //检查文件大小  if($result_type){     $result_size = $up_obj->check_size($get_fileSize);     if($result_size){      //文件上传保存        $pics = $up_obj->save_file($get_fileType,$get_TmpFiles);         $size = round($get_fileSize/1024,2);          $arr = array(            'name' => $get_fileName,             'pic' => $pics,             'size'=> $size,             'error' => 2         );        //检查文件上传状态       if($pics){         echo json_encode($arr);         /*         执行上传完成逻辑.....         */      }       }  } }