适配IE11踩雷备忘录

最最重要的放最前面：import ‘babel-polyfill’ 自己下一个 ‘babel-polyfill’ npm install babel-polyfill --save-dev 同时webpack.base.conf.js里面要 entry: { app: [‘babel-polyfill’, ‘./src/main.js’] }, 1.日历，IE11不认2020-01-01，要202

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