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