ruby安装

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git clone git://github.com/sstephenson/rbenv.git ~/.rbenv
git clone git://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build
git clone https://github.com/andorchen/rbenv-taobao-mirror.git ~/.rbenv/plugins/rbenv-taobao-mirror

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快速调试,irb的优点，能立刻验证你的想法，缺点是一但退出irb那么所有操作的东西就都没了

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