根据配置名加载配置
null Module_Cache::load_config( string $name )
参数列表
参数 类型 描述 默认值 $namestring$name 
protected function load_config($name)
{
    if (null===$name)
    {
        $name = Cache::DEFAULT_CONFIG_NAME;
    }
    if (is_array($name))
    {
        $this->config = $name;
    }
    else
    {
        $this->config = Core::config('cache.' . $name);
    }
    if (!isset($this->config['driver']))
    {
        $this->config['driver'] = Cache::DRIVER_FILE;
    }
}