1.yum安装node。
yum install -y nodejs
2.安装玩之后，默认版本v6.14（不支持需要的es2017）
node -v
3.升级node，下载 n管理包
npm install -g n
4.执行n 命令升级到v10.3.0
n 10.3.0 stable
5.重启centos7（必须）.查看node版本,更新到10.3.0
Centos7升级node
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