ajax上傳圖片到PHP并壓縮圖片顯示的方法

div id="main"> 
 div class="demo"> 
  div class="btn btn-success"> 
   span>上傳圖片/span> 
   input id="fileupload" type="file" name="mypic"> 
  /div> 
  !--加載進(jìn)度--> 
  div class="progress progress-striped"> 
   span class="progress-bar progress-bar-success bar" role="progressbar" aria-valuenow="60" aria-valuemin="0" aria-valuemax="100" style="">/span> 
   span class="percent">0%/span > 
  /div> 
  !--顯示圖片--> 
  div id="showimg">/div> 
  !--刪除圖片--> 
  div class="files">/div> 
 /div> 
/div> 

style type="text/css"> 
 .demo{width:580px; margin:30px auto} 
 .btn{position: relative;overflow: hidden;margin-right: 4px;} 
 .btn input {position: absolute;top: 0; right: 0;margin: 0;border: solid transparent;opacity: 0;filter:alpha(opacity=0);} 
 .progress { position:relative; margin-left:100px; margin-top:-24px; width:200px; border-radius:3px; display:none} 
 .percent { position:absolute; top:1px; left:2%; color:#fff } 
 .files{margin:10px 0} 
 .delimg{margin-left:20px; color:#090; cursor:pointer;margin-top: -6px;} 
/style> 
!--bootstrap.css3.3.7--> 
link rel="stylesheet"  integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous"> 

!--jquery1.8.1--> 
 script src="http://code.jquery.com/jquery-1.8.1.min.js">/script> 
 !--圖片jquery.form.js--> 
 script type="text/javascript" src="https://www.helloweba.net/demo/upload/jquery.form.js">/script> 
script type="text/javascript"> 
 $(function () { 
  //進(jìn)度條百分比加載顏色 
  var bar = $('.bar'); 
  //進(jìn)度條百分比 
  var percent = $('.percent'); 
  //圖片顯示 
  var showimg = $('#showimg'); 
  //進(jìn)度條 
  var progress = $(".progress"); 
  //新增 
  var files = $(".files"); 
  var btn = $(".btn span"); 
  $(".demo").wrap("form id='myupload' action='action.php' method='post' enctype='multipart/form-data'>/form>"); 
  //點擊上傳圖片 
  $("#fileupload").change(function(){ 
   //提交表單 
   $("#myupload").ajaxSubmit({ 
    dataType: 'json', 
    beforeSend: function() { 
 
     //顯示進(jìn)度條 
     progress.show(); 
     //進(jìn)度條為0 
     var percentVal = '0%'; 
     bar.width(percentVal); 
     percent.html(percentVal); 
     btn.html("上傳中..."); 
    }, 
    //上傳進(jìn)度 
    uploadProgress: function(event, position, total, percentComplete) { 
     //進(jìn)度條加載長度數(shù)據(jù)是number型 
     var percentVal = percentComplete + '%'; 
     bar.width(percentVal) 
     percent.html(percentVal); 
    }, 
    success: function(data) { 
     //上傳成功返回參數(shù) 
     files.html("b>"+data.name+"("+data.size+"k)/b> span class='delimg btn btn-danger' rel='"+data.pic+"'>刪除/span>"); 
     showimg.html("img src='"+data.pic+"'>"); 
     btn.html("上傳圖片"); 
    }, 
    error:function(xhr){ 
     //上傳失敗 
     btn.html("上傳失敗"); 
     bar.width('0') 
     files.html(xhr.responseText); 
    }, 
    clearForm: true 
   }); 
  }); 
 
  //刪除圖片js 
  $(".delimg").live('click',function(){ 
   //獲取圖片地址 
   var pic = $(this).attr("rel"); 
   $.post("action.php?act=delimg",{imagename:pic},function(msg){ 
    if(msg=='delete'){ 
     files.html("刪除成功."); 
     //刪除圖片效果 
     showimg.empty(); 
     //隱藏進(jìn)度條 
     progress.hide(); 
    }else{ 
     alert(msg); 
    } 
   }); 
  }); 
 }); 
/script> 

?php 
date_default_timezone_set("PRC"); 
//引入圖片壓縮類 
require 'imgcompress.class.php'; 
//如果有數(shù)據(jù)就是當(dāng)前數(shù)據(jù)，沒有為空 
$action=isset($_GET['act']) ? $action = $_GET['act']:''; 
$filename=isset($_POST['imagename']) ? $_POST['imagename']:''; 
 
if($action=='delimg'){ 
 
 if(!empty($filename)){ 
  //刪除圖片 
  unlink($filename); 
  //向頁面回調(diào)參數(shù) 
  echo 'delete'; 
 }else{ 
  echo '刪除失敗.'; 
 } 
 }else{ 
 //獲取圖片名字和原數(shù)據(jù) 
 $picname = $_FILES['mypic']['name']; 
 //獲取圖片大小 
 $picsize = $_FILES['mypic']['size']; 
 
 
 if ($picname != "") { 
 
  /** 
   * 
   * 注釋代碼為是否限制用戶上傳圖片大小和用戶上傳文件格式 
   */ 
//  if ($picsize > 512000) { //限制上傳大小 
//   echo '圖片大小不能超過500k'; 
//   exit; 
//  } 
//  $type = strstr($picname, '.'); //限制上傳格式 
//   if ($type != ".gif"  $type != ".jpg") { 
//       echo '圖片格式不對！'; 
//    exit; 
//   } 
//  $rand = rand(100, 999); 
//  $pics = date("YmdHis") . $rand . $type; //命名圖片名稱 
 
  //防止上傳圖片名中文亂碼 
  $name=iconv("UTF-8","gb2312", $picname); 
  //上傳路徑 
  $pic_path = "files/". $name; 
  //移動圖片位置 
  move_uploaded_file($_FILES['mypic']['tmp_name'], $pic_path); 
 } 
 //圖片地址 拿到圖片地址可以傳遞到數(shù)據(jù)庫 
 $source = "files/". $picname; 
 $size = round($picsize/1024,2); //轉(zhuǎn)換成kb 
 $arr = array( 
  'name'=>$picname, 
  'pic'=>$source, 
  'size'=>$size 
 ); 
 echo json_encode($arr); //輸出json數(shù)據(jù) 
 
 
 $dst_img = $picname; 
 $percent = 1; //原圖壓縮，不縮放 
 /** 
  * 方法一 
  * 壓縮圖片傳遞三個參數(shù) 
  * 1.資源文件 
  * 2.壓縮圖片質(zhì)量 1是最高，從0.1開始 
  * 3.圖片壓縮名字 
  */ 
 (new Compress($source,$percent))->compressImg($dst_img); 
 
 /** 
  * 方法二 
  * 1.資源文件 
  * 2.壓縮圖片質(zhì)量 
  * 3.圖片名字 
  */ 
// require 'image.class.php'; 
// $src = "001.jpg"; 
// $image = new Image($src);·············· 
// $image->percent = 0.2; 
// $image->saveImage(md5("aa123")); 
}