tar -xvf node-v4.4.1-linux-x64.tar.xz
用tar解压xz格式文件时出错：
tar (child): xz: Cannot exec: No such file or directory tar (child): Error is not recoverable: exiting now
解决办法:安装xz软件包,执行如下命令即可：
yum install xz -y
