反应base64解码给出引用错误

Question

我有这样的反应类..

class Questions extends React.Component {
   decodestr(decstr){
         var newstr = Base64.decode(decstr);
         return newstr;

   }
  render() {
     return(
      <div className="questions">
        {this.decodestr(this.props.cont)}
      </div>
      )
   }
}

我正在尝试在div中显示解码内容，如下所示：

<div> <span> <b>Questions Regulatory:</b></span> <span>{source.questions_regulatory}</span> </div>

其中{source.questions_regulatory}是编码内容..如何在此打印解码内容..现在出现如下错误：ReferenceError：Base64未定义

我使用npm install Base64 --save安装了Base64。

这是我的webpack配置;

var path = require('path');
var webpack = require('webpack');
var HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
  devtool:"eval",
  context:path.join(__dirname),
  entry: [
    'webpack-hot-middleware/client?reload=true',
    './src/index.jsx'
  ],
  output: {
    path: path.join(__dirname, 'dist'),
    filename: 'bundle.js',
    publicPath: '/static'
  },
  plugins: [
    new webpack.HotModuleReplacementPlugin(),
    new webpack.NoErrorsPlugin()
  ],
  resolve: {
    alias: {
      react: path.resolve('./node_modules/react')
    },
    extensions:[".js", ".jsx", ".webpack.js", ".web.js",""]
  },
  resolveLoader: {
    root: path.join(__dirname, "node_modules")
  },
  module: {
    loaders: [
      {
        test: /\.jsx?$/,
        exclude: /(node_modules)/,
        loader: 'babel',
        query: {
          presets: [
            require.resolve('babel-preset-es2015'),
            require.resolve('babel-preset-react')
          ]
        }
      },
      {
        test: /\.scss$/,
        loaders: ["style", "css", "sass"]
      },
      {
        test: /\.(jpg|png|svg)$/,
        loaders: [
            'file-loader?name=[path][name].[ext]'
        ]
      }
    ]
  }
};

不确定如何使用此React类渲染已解码的内容。也不确定为什么我会收到推荐错误...有任何帮助表示感谢...