出现The "topthink/think-installer" plugin was skipped because it requires a Plugin API version ("^1.0") that does not match your Composer installation ("2.1.0")

解决步骤：

①清除composer之前的镜像：composer config -g --unset repos.packagist

②更新thinkPHP版本：composer update topthink/framework  --no-plugins

③重新安装swoole插件：

composer require topthink/think-swoole=2.0.*