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