IE11浏览器报错 SCRIPT5009: "Promise"未定义

问题：Vue项目开发环境中在IE11正常运行，打包之后发布上线在IE11中报Promise 未定义

1.重要：确保webpack是2.6.1的版本，如果不是在package.json将webpack修改为”webpack”: “2.6.1”
I had this issue even with adding babel-polyfill, because of a bug with webpack 2.6.0. Upgrading to 2.6.1 solved the issue.
(由于webpack 2.6.0存在错误，即使添加了babel-polyfill，我也遇到了这个问题。 升级到2.6.1解决了这个问题。)

package.json

{
  "name": "coreui-vue",
  "version": "1.0.0-alpha.6",
  "description": "Open Source Admin Template",
  "author": "Łukasz Holeczek ",
  "private": true,
  "scripts": {
    "dev": "node build/dev-server.js",
    "start": "node build/dev-server.js",
    "build": "node build/build.js",
    "unit": "cross-env BABEL_ENV=test karma start test/unit/karma.conf.js --single-run",
    "e2e": "node test/e2e/runner.js",
    "test": "npm run unit && npm run e2e",
    "lint": "eslint --ext .js,.vue src test/unit/specs test/e2e/specs"
  },
  "dependencies": {
    "axios": "^0.17.1",
    "babel-polyfill": "^6.26.0",
    "babel-runtime": "^6.26.0",
    "chart.js": "2.5.0",
    "echarts": "^4.1.0",
    "element-ui": "^2.0.7",
    "jquery": "^3.2.1",
    "vue": "2.3.3",
    "vue-chartjs": "2.6.3",
    "vue-router": "2.5.3",
    "vue-strap": "github:wffranco/vue-strap"
  },
  "devDependencies": {
    "animate.css": "^3.5.2",
    "autoprefixer": "7.1.1",
    "babel-core": "6.24.1",
    "babel-eslint": "7.2.3",
    "babel-loader": "7.0.0",
    "babel-plugin-istanbul": "4.1.3",
    "babel-plugin-transform-runtime": "^6.22.0",
    "babel-preset-env": "1.5.1",
    "babel-preset-stage-2": "6.24.1",
    "babel-register": "6.24.1",
    "chai": "^3.5.0",
    "chalk": "^1.1.3",
    "chromedriver": "2.29.0",
    "connect-history-api-fallback": "^1.3.0",
    "copy-webpack-plugin": "^4.0.1",
    "cross-env": "5.0.0",
    "cross-spawn": "^5.0.1",
    "css-loader": "0.28.2",
    "eslint": "3.19.0",
    "eslint-config-standard": "10.2.1",
    "eslint-friendly-formatter": "3.0.0",
    "eslint-loader": "1.7.1",
    "eslint-plugin-html": "2.0.3",
    "eslint-plugin-import": "2.2.0",
    "eslint-plugin-node": "4.2.2",
    "eslint-plugin-promise": "3.5.0",
    "eslint-plugin-standard": "3.0.1",
    "eventsource-polyfill": "^0.9.6",
    "express": "4.15.3",
    "extract-text-webpack-plugin": "2.1.0",
    "file-loader": "0.11.1",
    "friendly-errors-webpack-plugin": "1.6.1",
    "fullcalendar": "^3.8.0",
    "html-webpack-plugin": "^2.28.0",
    "http-proxy-middleware": "0.17.4",
    "inject-loader": "3.0.0",
    "jquery": "^3.2.1",
    "karma": "1.7.0",
    "karma-coverage": "^1.1.1",
    "karma-mocha": "^1.3.0",
    "karma-phantomjs-launcher": "1.0.4",
    "karma-phantomjs-shim": "^1.4.0",
    "karma-sinon-chai": "1.3.1",
    "karma-sourcemap-loader": "^0.3.7",
    "karma-spec-reporter": "0.0.31",
    "karma-webpack": "2.0.3",
    "lolex": "^1.5.2",
    "mocha": "3.4.1",
    "nightwatch": "0.9.15",
    "node-sass": "^4.7.2",
    "opn": "5.0.0",
    "optimize-css-assets-webpack-plugin": "1.3.2",
    "ora": "1.2.0",
    "phantomjs-prebuilt": "^2.1.14",
    "rimraf": "^2.6.0",
    "sass-loader": "^6.0.6",
    "selenium-server": "3.4.0",
    "semver": "^5.3.0",
    "shelljs": "^0.7.6",
    "sinon": "2.3.1",
    "sinon-chai": "2.10.0",
    "url-loader": "^0.5.7",
    "vue-antd": "^0.2.9",
    "vue-fullcalendar": "^1.0.9",
    "vue-loader": "12.1.0",
    "vue-style-loader": "3.0.1",
    "vue-template-compiler": "2.3.3",
    "webpack": "2.6.1",
    "webpack-bundle-analyzer": "2.8.2",
    "webpack-dev-middleware": "1.10.2",
    "webpack-hot-middleware": "2.18.0",
    "webpack-merge": "4.1.0"
  },
  "engines": {
    "node": ">= 4.0.0",
    "npm": ">= 3.0.0"
  },
  "main": ".eslintrc.js",
  "directories": {
    "test": "test"
  },
  "license": "ISC"
}

修改package.json中webpack: ‘2.6.1’之后，如果npm run build打包报错，解决方法： 删除node-modules文件夹，重新npm install

2.webpack.base.conf.js 文件修改为

    entry: {
        app: ['babel-polyfill', './src/main.js']
    },

3.main.js 文件在第一行添加

import 'babel-polyfill'

官网使用polyfill的文档：https://babeljs.io/docs/en/babel-polyfill/#usage-in-node-browserify-webpack