使用node中的express解决vue-cli加载不到dev-server.js的问题

　　在使用vue开发过程中，难免需要去本地数据地址进行请求，而原版配置在dev-server.js中，新版vue-webpack-template已经删除dev-server.js，改用webpack.dev.conf.js代替，所以配置本地访问在webpack.dev.conf.js里配置即可。

　　现在我们就来用node里的express来解决本地数据请求的问题。主要为下面三步：安装express和resource、注册并使用vue-resource、配置express并设置路由规则

　　1、安装node的express，和vue-resource

　　2、注意：这里安装vue-resource后需要在main.js注册并使用下

import VueResource from 'vue-resource'
Vue.use(VueResource)

　　3、在webpack.dev.conf配置express并设置路由规则

#webpack.dev.conf.js
// 首先在const portfinder = require('portfinder')后添加// nodejs开发框架express，用来简化操作
const express = require('express')
// 创建node.js的express开发框架的实例
const app = express() 
// 引用的json地址
var appData = require('../data.json')
// json某一个key
var goods = appData.resultvar apiRoutes = express.Router()
app.use('/api', apiRoutes)

　　（1）get请求配置

#webpack.dev.conf.js
// 在devServer选项中添加以下内容
before(app) {app.get('/api/someApi', (req, res) => {res.json({// 这里是你的json内容
    })})
}

　　注意：修改配置文件完毕后，需要重新运行命令npm run dev即可。

　　（2）post请求配置。如果要配置post请求，需要在该文件夹配置如下：

#webpack.dev.conf.js
apiRoutes.post('/foods', function (req, res) { //注意这里改为post就可以了
  res.json({error: 0,data: foods});
})
// 在组件里面
#...vue
created () {this.$http.post('http://localhost:8080/api/foods').then((res) => {console.log(res)})
}

　　（3）完整配置

'use strict'
const utils = require('./utils')
const webpack = require('webpack')
const config = require('../config')
const merge = require('webpack-merge')
const path = require('path')
const baseWebpackConfig = require('./webpack.base.conf')
const CopyWebpackPlugin = require('copy-webpack-plugin')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const FriendlyErrorsPlugin = require('friendly-errors-webpack-plugin')
const portfinder = require('portfinder')const HOST = process.env.HOST
const PORT = process.env.PORT && Number(process.env.PORT)//增加express --start
const express = require('express')
const app = express()
var appData = require('../goods.json')
var goods = appData.goods
var apiRoutes = express.Router()
app.use('/api', apiRoutes)
//增加express --endconst devWebpackConfig = merge(baseWebpackConfig, {module: {rules: utils.styleLoaders({ sourceMap: config.dev.cssSourceMap, usePostCSS: true })},// cheap-module-eval-source-map is faster for development
  devtool: config.dev.devtool,// these devServer options should be customized in /config/index.js
  devServer: {clientLogLevel: 'warning',historyApiFallback: {rewrites: [{ from: /.*/, to: path.posix.join(config.dev.assetsPublicPath, 'index.html') },],},hot: true,contentBase: false, // since we use CopyWebpackPlugin.compress: true,host: HOST || config.dev.host,port: PORT || config.dev.port,open: config.dev.autoOpenBrowser,overlay: config.dev.errorOverlay? { warnings: false, errors: true }: false,publicPath: config.dev.assetsPublicPath,proxy: config.dev.proxyTable,quiet: true, // necessary for FriendlyErrorsPlugin
    watchOptions: {poll: config.dev.poll,},//增加express --start
    before(app) {app.get('/api/goods', (req, res) => {res.json({code: 0,data: goods})})}//增加express --end
  },plugins: [new webpack.DefinePlugin({'process.env': require('../config/dev.env')}),new webpack.HotModuleReplacementPlugin(),new webpack.NamedModulesPlugin(), // HMR shows correct file names in console on update.new webpack.NoEmitOnErrorsPlugin(),// https://github.com/ampedandwired/html-webpack-pluginnew HtmlWebpackPlugin({filename: 'index.html',template: 'index.html',inject: true}),// copy custom static assetsnew CopyWebpackPlugin([{from: path.resolve(__dirname, '../static'),to: config.dev.assetsSubDirectory,ignore: ['.*']}])]
})module.exports = new Promise((resolve, reject) => {portfinder.basePort = process.env.PORT || config.dev.portportfinder.getPort((err, port) => {if (err) {reject(err)} else {// publish the new Port, necessary for e2e testsprocess.env.PORT = port// add port to devServer configdevWebpackConfig.devServer.port = port// Add FriendlyErrorsPlugindevWebpackConfig.plugins.push(new FriendlyErrorsPlugin({compilationSuccessInfo: {messages: [`Your application is running here: http://${devWebpackConfig.devServer.host}:${port}`],
        },onErrors: config.dev.notifyOnErrors? utils.createNotifierCallback(): undefined}))resolve(devWebpackConfig)}})
})