ionic 启动项目时报Error: Node Sass does not yet supportXXX错误

作者：LoveEmperor-王子様

错误例：

Error: Node Sass does not yet support your current environment: Windows 64-bit w
ith Unsupported runtime (57)
For more information on which environments are supported please see:
https://github.com/sass/node-sass/releases/tag/v4.5.0

这种问题如果之前还可以，一般是node升级导致。
输入指令：npm install --save node-sass
如果有错：请再来
npm uninstall --save node-sass
npm install --save node-sass

或者用cnpm；