Error fetching https://gems.ruby-china.org/: bad response Not Found 404 (https://gems.ruby-china.org/specs.4.8.gz)
https://gems.ruby-china.org/ 访问不了
域名改为
所以替换 ruby-china 提供镜像，正确的操作是：
$ sudo gem update --system
$ gem sources --remove https://rubygems.org/
$ gem sources --remove https://ruby.taobao.org/ //如果安装了淘宝的镜像
//等有反应之后再敲入以下命令
gem sources -a https://gems.ruby-china.com/
为了验证你的Ruby镜像是并且仅是ruby-china，可以用以下命令查看：
$ gem sources -l
*** CURRENT SOURCES ***
终端输入
sudo gem update –system
显示如下错误
ERROR: While executing gem … (Gem::FilePermissionError)
You don’t have write permissions for the /usr/bin directory.
重新输入下面
sudo gem install -n /usr/local/bin sass
sudo gem install -n /usr/local/bin cocoapods
sudo gem install -n /usr/local/bin generamba(generamba是安装插件的名称)
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