vue中怎么引入bootstrap

$ npm install jquery --save-dev

+ const webpack = require("webpack");
module.exports = {
 entry: './index.js',
 output: {
 path: path.join(__dirname, './dist'),
 publicPath: '/dist/',
 filename: 'index.js'
 },
 + plugins: [
 new webpack.ProvidePlugin({
 jQuery: 'jquery',
 $: 'jquery'
 })
 ]
}

import $ from 'jquery' ;