系统升级到Mac OS X EI Capitan后，使用命令：sudo gem install cocoapods，安装cocoapods，出现以下错误：
ERROR:Could not find a valid gem 'cocoapods' (>= 0), here is why:Unable to download data from http://ruby.taobao.org/ - bad response Not Found 404 (http://ruby.taobao.org/latest_specs.4.8.gz)
解决方法：
1. gem sources --remove http://ruby.taobao.org/
2. gem sources -a https://ruby.taobao.org/
再次尝试：sudo gem install cocoapods，出现新的错误：
ERROR:While executing gem ... (Errno::EPERM)
Operation not permitted - /usr/bin/xcodeproj
解决方法：
sudo gem install -n /usr/local/bin cocoapods
OK!
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