/js/jquery.imgareaselect-0.9.10/css/imgareaselect-default.css 

/js/jquery.imgareaselect-0.9.10/scripts/jquery.imgareaselect.min.js 
/js/AjaxFileUploaderV2.1/ajaxfileupload.js

<div>
  <img src='blank.jpg' id="mainimg">
</div>
<div id="myPreview" >
  <img src="blank.jpg" id="mainimgthumb" />
</div>
  <form name="fmCrop">
    <input type="hidden" name="src_path" value="" />
    <input type="hidden" name="x1" value="" />
    <input type="hidden" name="x2" value="" />
    <input type="hidden" name="y1" value="" />
    <input type="hidden" name="y2" value="" />
    <input type="submit" name="btnSubmit" class="baseinf_but1" style="display:none" value="確定" />
  </form>

$("#mainimg_src", content).load(function () {
    crop($("#mainimg", content));
   });

   function crop($img) { //$img是
             //縮小比例
             var scalex =$img.width() / $("#mainimg_src").width();
             var scaley =$img.height() / $("#mainimg_src").height();

             $img.imgAreaSelect({
               x1:0,y1:0,x2:150,y2:150,
               handles: true, aspectRatio: '1:1',
               onSelectEnd: function (img, selection) {
                 var scaleX = 100 / (selection.width || 1);
                 var scaleY = 100 / (selection.height || 1);

                 $('#mainimgthumb').css({
                   width: Math.round(scaleX * 400) + 'px',
                   height: Math.round(scaleY * 300) + 'px',
                   marginLeft: '-' + Math.round(scaleX * selection.x1) + 'px',
                   marginTop: '-' + Math.round(scaleY * selection.y1) + 'px'
                 });
                 $('input[name="x1"]', content).val(selection.x1/scalex);
                 $('input[name="y1"]', content).val(selection.y1/scaley);
                 $('input[name="x2"]', content).val(selection.x2/scalex);
                 $('input[name="y2"]', content).val(selection.y2/scaley);
               }
             });
           }

          //確定剪切
$("form[name=fmCrop]", content).submit(function () {
  var data = $("form[name=fmCrop]", content).serializeArray();
  $.get('/members/web-members-rest/crop.html', data, function (r) {
    switch (r.result) {
       case "Success":
         jAlert("操作成功");
         $("#left_mainimg").attr("src", "/" + r.path + '?a=' + (new Date()).format('yyyyMMddhhmmss'));
         $("#myPreview", content).css("display", "block");
         $("#myPreview", content).prev().css("display", "none");
         $("#mainimg", content).imgAreaSelect({ hide: true });
         $("form[name=fmUpload]", content).css("display", "none");
         $("input[name=btnSubmit]", content).css("display", "none");
         break;
        }
  });
  return false;
});

public function actionCrop($src_path,$x1,$x2,$y1,$y2){
    $pic =$src_path;

    $width = $x2-$x1;
    $height = $y2-$y1;

    $type=exif_imagetype($pic); //判斷文件類型
    $support_type=array(IMAGETYPE_JPEG , IMAGETYPE_PNG , IMAGETYPE_GIF);
    if(!in_array($type, $support_type,true)) {
      echo "this type of image does not support! only support jpg , gif or png";
      exit();
    }
    switch($type) {
      case IMAGETYPE_JPEG :
        $image = imagecreatefromjpeg($pic);
        break;
      case IMAGETYPE_PNG :
        $image = imagecreatefrompng($pic);
        break;
      case IMAGETYPE_GIF :
        $image = imagecreatefromgif($pic);
        break;
      default:
        echo "Load image error!";
        exit();
    }

    $copy = $this->PIPHP_ImageCrop($image, $x1, $y1, $width, $height);//裁剪

    imagejpeg($copy, $src_path); //替換新圖
    return ['result'=>'Success','path'=>$src_path]; //返回新圖地址
  }
  function PIPHP_ImageCrop($image, $x, $y, $w, $h){
    $tw = imagesx($image); 
    $th = imagesy($image); 

    if ($x > $tw || $y > $th || $w > $tw || $h > $th) return FALSE; 

    $temp = imagecreatetruecolor($w, $h); 
    imagecopyresampled($temp, $image, 0, 0, $x, $y, $w, $h, $w, $h); 
    return $temp; 
  }