报错:This usually happens because your environment has changed since running npm install.
Run npm rebuild node-sass to download the binding for your current environment.
原因:运行npm安装后环境发生变化 而以上报错提示需要重建sass节点
解决方法: npm rebuild node-sass再npm run dev
如果还是不行:先npm install node-sass 再 npm rebuild node-sass后执行npm run dev
