blueimp jquery file upload如何将范例UploadHandeler.php上传的路径写对在laravel

Question

https://blueimp.github.io/jQu...
Basic Plus Ui的demo
我想要给他上传到
public/pictures 资料夹

范例这里要怎样改？

UploadHandeler.php

public function __construct($options = null, $initialize = true,
$error_messages = null) {

    $this->response = array();
    $this->options = array(
        'script_url' => $this->get_full_url().'/'.$this->basename($this->get_server_var('SCRIPT_NAME')),
        'upload_dir' => dirname($this->get_server_var('SCRIPT_FILENAME')).'/files/',
        'upload_url' => $this->get_full_url().'/files/',

请问这里指的'script_url' 是什么？

还有我改了很多次不晓得要如何图片上传改到
public/pictures/ 内

       'script_url' => $this->get_full_url().'/'.$this->basename($this->get_server_var('SCRIPT_NAME')),
        'upload_dir' => dirname($this->get_server_var('SCRIPT_FILENAME')).'/pictures/',
        'upload_url' => $this->get_full_url().'/pictures/',

这样子还是没有任何档案会上传成功？
请问这里是要怎么写？