erp/core/CoreApp/controllers/Aliyuntp.php

<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class Aliyuntp  extends Start_Controller {

    public function __construct() {
        parent::__construct();
        $this->load->library('session');
        $this->load->_model("Model_aliyunoss","aliyunoss");
    }

    //定义方法的调用规则 获取URI第二段值
    public function _remap($arg,$arg_array)
    {
        if($arg == 'get_oss_sign')//添加
        {
             $this->_get_oss_sign();
        }else{
            defined('BASEPATH') OR exit('No direct script access allowed');
        }
    }
    private function _get_oss_sign(){
        $res = $this->aliyunoss->getOssSign();

        echo json_encode($res,JSON_UNESCAPED_UNICODE);
    }
}