PhantomJS 2.1.1 (Mac OS X 0.0.0) ERROR Error: [vuex] vuex requires a Promise polyfill in this browser. at webpack:///~/vuex/dist/vuex.js:145:0 <- index.js:9871
解决方法：
npm install --save-dev babel-polyfill
karma.conf.js
files: [ ‘../node_modules/babel-polyfill/dist/polyfill.js‘, ‘index.js‘ ],
