输入npm install 

报以下错误

npm ERR! code ELIFECYCLEnpm ERR! errno 1npm ERR! node-sass@4.13.1 postinstall: `node scripts/build.js`npm ERR! Exit status 1npm ERR!npm ERR! Failed at the node-sass@4.13.1 postinstall script.npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

这个是因为sass安装时获取源的问题，修改sass安装的源

npm config set sass_binary_site=https://npm.taobao.org/mirrors/node-sass

然后运行

npm install