Official mirrors
The official Arch Linux mirror list is available from the pacman-mirrorlist package. To get an even more up-to-date list of mirrors, use the Pacman Mirror List Generator page on the main site.
In the unlikely scenario that you are without any configured mirrors and pacman-mirrorlist is not installed, run the following command:
手动下载镜像列表
有时因为系统镜像列表丢失或可读性不强，我们需要从官方网站下载按地区分类的镜像列表，很简单，执行如下命令：
wget -O /etc/pacman.d/mirrorlist https://www.archlinux.org/mirrorlist/all/