core/Controller.php
public function param(string $name = null, $def = null)
    {
        return Request::param($name, $def);
    }
public function param(string $name = null, $def = null)
    {
        return Request::param($name, $def);
    }
param 获取数据 相当于 $_REQUEST
@param string|null $name
@param null $def
@return array|mixed|null