var isEqual = require('lodash.isequal')
// or ES6
import isEqual from 'lodash.isequal'
isEqual([1, 2, 3], [1, 2, 3]) // true

var difference = require('lodash/difference')
// or ES6
import difference from 'lodash/difference'
difference([1, 2], [1, 3]) // [2]

import remove from 'lodash/remove'
import uniq from 'lodash/uniq'
import invokeMap from 'lodash/invokeMap'
import sortBy from 'lodash/sortBy'
// more...

$ npm i -S lodash-webpack-plugin babel-plugin-lodash babel-core babel-loader babel-preset-es2015 webpack

webpack.config.js
var LodashModuleReplacementPlugin = require('lodash-webpack-plugin');
var webpack = require('webpack');
module.exports = {
 module: {
 loaders: [{
 loader: 'babel',
 test: /\.js$/,
 exclude: /node_modules/,
 query: {
 plugins: ['transform-runtime', 'lodash'],
 presets: ['es2015']
 }
 }]
 },
 plugins: [
 new LodashModuleReplacementPlugin,
 new webpack.optimize.OccurrenceOrderPlugin,
 new webpack.optimize.UglifyJsPlugin
 ]
}

webpack.config.js
var LodashModuleReplacementPlugin = require('lodash-webpack-plugin');
var webpack = require('webpack');
module.exports = {
 module: {
 loaders: [{
 loader: 'babel',
 test: /\.js$/,
 exclude: /node_modules/
 }]
 },
 babel: {
 presets: ['es2015'],
 plugins: ['transform-runtime', 'lodash']
 },
 plugins: [
 new LodashModuleReplacementPlugin,
 new webpack.optimize.OccurrenceOrderPlugin,
 new webpack.optimize.UglifyJsPlugin
 ]
}

import _ from 'lodash'
_.add(1, 2) // 打包时只会引入这一个函数模块