react16在ie11下运行

npm install react-app-polyfill

import 'react-app-polyfill/ie11';
import 'react-app-polyfill/stable';
import 'core-js/stable';
import 'regenerator-runtime/runtime';

"browserslist": {
  "production": [
    ">0.2%",
    "not dead",
    "not op_mini all",
    "ie 11"
  ],
  "development": [
    "last 1 chrome version",
    "last 1 firefox version",
    "last 1 safari version",
    "ie 11"
  ]
},