v9.11.1当我尝试使用npm时，我刚刚安装了节点，但不断出现以下错误：
npm WARN npm npm does not support Node.js v9.11.1
npm WARN npm You should probably upgrade to a newer version of node as we
npm WARN npm can't make any promises that npm will work with this version.
npm WARN npm Supported releases of Node.js are the latest release of 4, 6, 7, 8.
npm WARN npm You can find the latest version at https://nodejs.org/
我尝试这样做，npm i -g npm但是它无法更新自身，只是不断在上面抛出相同的错误。
当我运行npm -v它时，5.5.1它似乎是当前的最新版本5.8.0 …