安装记录
https://nodejs.org/dist/latest-v7.x/
下载
node-v6.10.2-linux-x64.tar.xz
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tar -xJf node-v6.10.2-linux-x64.tar.xz
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sudo mv node-v6.10.2-linux-x64/ /opt/
sudo ln -s /opt/node-v4.4.4-linux-x64/bin/node /usr/local/bin/node
sudo ln -s /opt/node-v4.4.4-linux-x64/bin/npm /usr/local/bin/npm
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