php异步上传文件

<form class="upload_pic_wrap" name="registerPerFrom" target="upload_file" enctype="multipart/form-data" method="POST" action="<?=UrlService::buildWeb("/upload/pic");?>">
    <div class="upload_wrap pull-left">
       <i class="fa fa-upload fa-2x"></i>
       <input type="file" name="licensePhoto" accept="image/png, image/jpeg, image/jpg,image/gif">
    </div>
</form>
<iframe class="hide" name="upload_file"></iframe>
<script>
    $('[name=registerPerFrom] input[name=licensePhoto]').change(function () {
        $('[name=registerPerFrom]').submit();
    });
</script>

在form上面添加target属性，将提交结果返回到iframe里面