错误：SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode
node版本低，node5.0在文件第一行加 ”use strict”，或者更新node
brew upgrade node#更新node
curl -sL https://deb.nodesource.com/setup_6.x | bash –
apt-get install nodejs
错误：cross-env NODE_ENV=development webpack –watch –progress –hide-modules –config=node_modules/laravel-mix/setup/webpack.config.js
npm rebuild node-sass
npm run dev#successfully