使用官方的react-app-polyfill时，ES6的部分语法仍不兼容IE11，这时使用@babel/polyfill库
首先 npm install --save @babel/polyfill 安装相关依赖包
在webpack.config.js中配置该文件
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在entry中添加'@babel/polyfill',
entry: [
// Include an alternative client for WebpackDevServer. A client's job is to
// connect to WebpackDevServer by a socket and get notified about changes.
// When you save a file, the client will either apply hot updates (in case
// of CSS changes), or refresh the page (in case of JS changes). When you
// make a syntax error, this client will display a syntax error overlay.
// Note: instead of the default WebpackDevServer client, we use a custom one
// to bring better experience for Create React App users. You can replace
// the line below with these two lines if you prefer the stock client:
// require.resolve('webpack-dev-server/client') + '?/',
// require.resolve('webpack/hot/dev-server'),
'@babel/polyfill', // 此为新添加的解析器
isEnvDevelopment &&
require.resolve('react-dev-utils/webpackHotDevClient'),
// Finally, this is your app's code:
paths.appIndexJs,
// We include the app code last so that if there is a runtime error during
// initialization, it doesn't blow up the WebpackDevServer client, and
// changing JS code would still trigger a refresh.
].filter(Boolean),
配置完后删除node_module包，再重新npm i 下载node_module包。
这样就配置完毕了，不需要在index .js文件中引入相关的依赖包,直接在IE11中启动项目即可.
