问题: Module build failed: Error: Couldn't find preset "stage-0": http://www.ruanyifeng.com/blog/2016/01/babel.html 解决: npm install --save-dev babel-preset-stage-0
问题: mac os npm WARN saveError ENOENT: no such file or directory, open '/Users/summer/package.json'
解决: 使用 npm init 初始化