yarn add jquery -D
修改.electron-vue/webpack.renderer.config.js

  plugins: [
    new VueLoaderPlugin(),
    new MiniCssExtractPlugin({filename: 'styles.css'}),
    new HtmlWebpackPlugin({
      filename: 'index.html',
      template: path.resolve(__dirname, '../src/index.ejs'),
      minify: {
        collapseWhitespace: true,
        removeAttributeQuotes: true,
        removeComments: true
      },
      nodeModules: process.env.NODE_ENV !== 'production'
        ? path.resolve(__dirname, '../node_modules')
        : false
    }),
    new webpack.HotModuleReplacementPlugin(),
    new webpack.NoEmitOnErrorsPlugin(),
    //增加下面三行
    new webpack.ProvidePlugin({
      jQuery:'jquery',
      $:'jquery',
    })
  ],

然后就可以使用了

import 'jquery'