IE11中针对React 15.5.4的两个错误：＆＃34;提供给`HashRouter`的无效prop`child`，期望一个ReactNode。 ＆＃34;和＃34;未知的浏览器＆＃34;在bundle.js中

Question

我的React + Webpack应用程序在开发模式下在Chrome和FF中正常运行，但在IE11中运行不正常。我也使用了babel-polyfill，但它没有用。

有两个主要问题：beblow：

1. 警告：道具类型失败：提供给children的道具HashRouter无效，需要一个ReactNode。

2. SCRIPT5022：未知浏览器:( 这个问题指出bundle.js中的错误如下：

   if (isChrome()) {
       regex = /^ +at.+\((.*):([0-9]+):([0-9]+)/;
       expected_fields = 4;
       // (skip first line containing exception message)
       skip_lines = 1;
   } else if (isFirefox()) {
       regex = /@(.*):([0-9]+):([0-9]+)/;
       expected_fields = 4;
       skip_lines = 0;
   } else {
       throw new Error("unknown browser :(");
   }
   

此代码表示当我使用IE时，将抛出错误unknow browser :(。但为什么我的bundle.js中有这些代码？我不知道如何解决这类问题。我搜索了很久，但遗憾的是没有找到相关的答案。

以下是项目依赖项：

"dependencies": {
    "antd": "^2.11.0",
    "babel-plugin-react-html-attrs": "^2.0.0",
    "babel-polyfill": "^6.23.0",
    "babel-preset-es2015": "^6.24.1",
    "babel-preset-react": "^6.24.1",
    "babelify": "^7.3.0",
    "css-loader": "^0.25.0",
    "fetch": "^1.1.0",
    "history": "^4.6.1",
    "react": "^15.5.4",
    "react-dom": "^15.5.4",
    "react-hot-loader": "^3.0.0-beta.7",
    "react-mixin": "^2.0.2",
    "react-responsive": "^1.3.0",
    "react-router": "^4.1.1",
    "react-router-dom": "^4.1.1",
    "style-loader": "^0.13.1"
  },
  "devDependencies": {
    "babel-core": "^6.24.1",
    "babel-loader": "^7.0.0",
    "babel-plugin-import": "^1.2.1",
    "extract-text-webpack-plugin": "^2.1.2",
    "file-loader": "^0.11.2",
    "url-loader": "^0.5.9",
    "webpack": "^2.6.0",
    "webpack-dev-server": "^2.4.5"
  },

有没有人遇到同样的问题，任何建议都会非常感激。