composer优化，安装类库

中国全量镜像

composer config -g repo.packagist composer https://packagist.phpcomposer.com

composer token

进入https://github.com/settings/tokens 点击 「Generate new token」 新建一个 Token，选择默认新建就行，然后就会得到一个 Token，然后输入这个值就 OK 了。

Q&A

Your requirements could not be resolved to an installable set of packages

执行

composer global require "fxp/composer-asset-plugin:@dev"