上传图片到PHP服务器

test_picture = function() {
            api.getPicture({
                    sourceType: 'library',
                    encodingType: 'png',
                    mediaValue: 'pic',
                    destinationType: 'url',
                    allowEdit: true,
                    //quality: ,
                    //targetWidth:,
                    //targetHeight:,
                    saveToPhotoAlbum: false
                }, function(ret, err){
                    if (ret) {
                     api.ajax({
                  timeout : ,
                  method : 'post',
                  url : 'http://192.168.1.121/picture.php',
                  data : {
                          files:{upfile : ret.data},
                  },
                  dataType : 'json',
              }, function(ret, err) {
                  api.hideProgress();
                  alert(JSON.stringify(ret));
              });
                    } else {
                        api.alert({msg:err.msg});
                    };
                });
    };

PHP接收图片
<?php
function getname($exname){
        $dir = "./uploadfile/";
           $i=;
           if(!is_dir($dir)){
              mkdir($dir,);
           }
           while(true){
            if(!is_file($dir.$i.".".$exname)){
                $name=$i.".".$exname;
                break;
              }
             $i++;
           }
           return $dir.$name;
}

$exname=strtolower(substr($_FILES['upfile']['name'],(strrpos($_FILES['upfile']['name'],'.')+)));

$uploadfile = getname($exname); 

if (move_uploaded_file($_FILES['upfile']['tmp_name'], $uploadfile)) {

   echo "<h2><font color=#ff0000>文件上传成功！</font></h2><br><br>";

} else {

   echo "<h2><font color=#ff0000>文件上传失败！</font></h2><br><br>";

}
?>