1.安装 nodejs

进入官网下载Nodejs并安装

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2.安装 git

进入Git官网下载并安装

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3.下载 vue-element-admin

进入Github下载并解压

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# clone the project

git clone https://github.com/PanJiaChen/vue-admin-template.git

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# enter the project directory

cd vue-admin-template

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# install dependency

npm install

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# develop

npm run dev

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** # 删除多余界面 router/index**

将router/inedx.js修改如下：

import Router from 'vue-router'

 Vue.use(Router)

/* Layout */

import Layout from '@/layout'

/**

 * Note: sub-menu only appear when route children.length >= 1

* Detail see: https://panjiachen.github.io/vue-element-admin-site/guide/essentials/router-and-nav.html

 *

* hidden: true                  if set true, item will not show in the sidebar(default is false)

* alwaysShow: true              if set true, will always show the root menu

 *                                if not set alwaysShow, when item has more than one children route,

*                                it will becomes nested mode, otherwise not show the root menu

* redirect: noRedirect          if set noRedirect will no redirect in the breadcrumb

 * name:'router-name'            the name is used by <keep-alive> (must set!!!)

* meta : {
 
    roles: ['admin','editor']    control the page roles (you can set multiple roles)

    title: 'title'              the name show in sidebar and breadcrumb (recommend set)

   icon: 'svg-name'            the icon show in the sidebar

     breadcrumb: false            if set false, the item will hidden in breadcrumb(default is true)
 
     activeMenu: '/example/list'  if set path, the sidebar will highlight the path you set
 
   }
 
 */
 
 /**
 
 * constantRoutes

 * a base page that does not have permission requirements

 * all roles can be accessed
 
 */
 
export const constantRoutes = [

 {

   path: '/login',
 
     component: () => import('@/views/login/index'),
 
     hidden: true
 
  },
 
  {

     path: '/404',
 
     component: () => import('@/views/404'),
 
     hidden: true
 
   },
 
   {
 
     path: '/',
 
     component: Layout,
 
     redirect: '/dashboard',
 
     children: [{

      path: 'dashboard',

       name: 'Dashboard',
 
       component: () => import('@/views/dashboard/index'),
 
       meta: { title: 'Dashboard', icon: 'dashboard' }
 
     }]
 
  },
 
   // 404 page must be placed at the end !!!
 
   { path: '*', redirect: '/404', hidden: true }
 
 ]
 
 const createRouter = () => new Router({
 
  // mode: 'history', // require service support

   scrollBehavior: () => ({ y: 0 }),
 
   routes: constantRoutes
 
 })
 
 const router = createRouter()
 
 // Detail see: https://github.com/vuejs/vue-router/issues/1234#issuecomment-357941465

export function resetRouter() {

 const newRouter = createRouter()

   router.matcher = newRouter.matcher // reset router
 
 }

export default router

修改后的界面：

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安装ES6语法插件

npm install --save es6-promise

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进入..\src\utils配置Axios文件

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编写http.js

import Vue from 'vue';
import Axios from 'axios';
import {Promise} from 'es6-promise';

import {MessageBox, Message} from 'element-ui'

Axios.defaults.timeout = 30000; // 1分钟
Axios.defaults.baseURL = '';

Axios.interceptors.request.use(function (config) {
  // Do something before request is sent
  //change method for get
  /*if(process.env.NODE_ENV == 'development'){
      config['method'] = 'GET';
      console.log(config)
  }*/
  if (config['MSG']) {
    // Vue.prototype.$showLoading(config['MSG']);
  } else {
    // Vue.prototype.$showLoading();
  }
  // if(user.state.token){//用户登录时每次请求将token放入请求头中
  //   config.headers["token"] = user.state.token;
  // }

  if (config['Content-Type'] === 'application/x-www-form-urlencoded;') {//默认发application/json请求，如果application/x-www-form-urlencoded;需要使用transformRequest对参数进行处理
    /*config['Content-Type'] = 'application/x-www-form-urlencoded;charset=UTF-8';*/
    config.headers['Content-Type'] = 'application/x-www-form-urlencoded;charset=UTF-8';
    config['transformRequest'] = function (obj) {
      var str = [];
      for (var p in obj)
        str.push(encodeURIComponent(p) + "=" + encodeURIComponent(obj[p]));
      return str.join("&")
    };
  }
  //config.header['Content-Type'] = 'application/x-www-form-urlencoded; charset=UTF-8';

  return config;
}, function (error) {
  // Do something with request error
  // Vue.$vux.loading.hide()
  return Promise.reject(error);
});

Axios.interceptors.response.use(
  response => {
    // Vue.$vux.loading.hide();
    return response.data;
  },
  error => {
    // Vue.$vux.loading.hide();
    if (error.response) {
      switch (error.response.status) {
        case 404:
          Message({
            message: '' || 'Error',
            type: 'error',
            duration: 5 * 1000
          })
          break;
        default:
          Message({
            message: '' || 'Error',
            type: 'error',
            duration: 5 * 1000
          })
      }
    } else if (error instanceof Error) {
      console.error(error);
    } else {
      Message({
        message: '' || 'Error',
        type: 'error',
        duration: 5 * 1000
      })
    }

    return Promise.reject(error.response);
  });

export default Vue.prototype.$http = Axios;

配置axios代理：

vue.config.js ↓

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'use strict'
const path = require('path')
const defaultSettings = require('./src/settings.js')

function resolve(dir) {
  return path.join(__dirname, dir)
}

const name = defaultSettings.title || 'vue Admin Template' // page title

// If your port is set to 80,
// use administrator privileges to execute the command line.
// For example, Mac: sudo npm run
// You can change the port by the following methods:
// port = 9528 npm run dev OR npm run dev --port = 9528
const port = process.env.port || process.env.npm_config_port || 9528 // dev port

// All configuration item explanations can be find in https://cli.vuejs.org/config/
module.exports = {
  /**
   * You will need to set publicPath if you plan to deploy your site under a sub path,
   * for example GitHub Pages. If you plan to deploy your site to https://foo.github.io/bar/,
   * then publicPath should be set to "/bar/".
   * In most cases please use '/' !!!
   * Detail: https://cli.vuejs.org/config/#publicpath
   */
  publicPath: '/',
  outputDir: 'dist',
  assetsDir: 'static',
  lintOnSave: process.env.NODE_ENV === 'development',
  productionSourceMap: false,
  devServer: {
    port: port,
    open: true,
    overlay: {
      warnings: false,
      errors: true
    },
    proxy: {
      // change xxx-api/login => mock/login
      // detail: https://cli.vuejs.org/config/#devserver-proxy
      [process.env.VUE_APP_BASE_API]: {
        target: `http://127.0.0.1:${port}/mock`,
        changeOrigin: true,
        pathRewrite: {
          ['^' + process.env.VUE_APP_BASE_API]: ''
        }
      },
      ['/api']: {
        target: `http://127.0.0.1:3000`,
        changeOrigin: true,
        pathRewrite: {
          ['^' + '/api']: ''
        }
      }
    },
    after: require('./mock/mock-server.js')
  },
  configureWebpack: {
    // provide the app's title in webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.
    name: name,
    resolve: {
      alias: {
        '@': resolve('src')
      }
    }
  },
  chainWebpack(config) {
    config.plugins.delete('preload') // TODO: need test
    config.plugins.delete('prefetch') // TODO: need test

    // set svg-sprite-loader
    config.module
      .rule('svg')
      .exclude.add(resolve('src/icons'))
      .end()
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()

    // set preserveWhitespace
    config.module
      .rule('vue')
      .use('vue-loader')
      .loader('vue-loader')
      .tap(options => {
        options.compilerOptions.preserveWhitespace = true
        return options
      })
      .end()

    config
    // https://webpack.js.org/configuration/devtool/#development
      .when(process.env.NODE_ENV === 'development',
        config => config.devtool('cheap-source-map')
      )

    config
      .when(process.env.NODE_ENV !== 'development',
        config => {
          config
            .plugin('ScriptExtHtmlWebpackPlugin')
            .after('html')
            .use('script-ext-html-webpack-plugin', [{
            // `runtime` must same as runtimeChunk name. default is `runtime`
              inline: /runtime\..*\.js$/
            }])
            .end()
          config
            .optimization.splitChunks({
              chunks: 'all',
              cacheGroups: {
                libs: {
                  name: 'chunk-libs',
                  test: /[\\/]node_modules[\\/]/,
                  priority: 10,
                  chunks: 'initial' // only package third parties that are initially dependent
                },
                elementUI: {
                  name: 'chunk-elementUI', // split elementUI into a single package
                  priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
                  test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
                },
                commons: {
                  name: 'chunk-commons',
                  test: resolve('src/components'), // can customize your rules
                  minChunks: 3, //  minimum common number
                  priority: 5,
                  reuseExistingChunk: true
                }
              }
            })
          config.optimization.runtimeChunk('single')
        }
      )
  }
}

main.js中加入http

import http from './utils/http'
Vue.use(http)

调用接口

···
<template>
<div class="dashboard-container">
欢迎
</div>
</template>

<script>
import { mapGetters } from 'vuex'

export default {
name: 'Dashboard',
computed: {
...mapGetters([
'name'
])
},
mounted(){
this.$http.get('/api/users/add').then(res => {
console.log('this.panels', res)
})
}
}
</script>

<style lang="scss" scoped>
.dashboard {
&-container {
margin: 30px;
}
&-text {
font-size: 30px;
line-height: 46px;
}
}
</style>
···

全局安装koa-generator,执行下面命令

npm install -g koa-generator

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构建koa2项目代码如下

koa2 projectName

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初始化后台项目插件，命令如下:

cd projectName

初始化项目，如果没有安装git会报错.

npm install

项目试运行

npm run dev

成功运行

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成功登录

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本人数据库名为test
mongo "mongodb+srv://cluster0.rsqsm.mongodb.net/Project"?retryWrites=true&w=majority

安装mongoose

npm install mongoose --save

在第7步建好的nodejs项目中根目录创建db目录

下面代码中连接密码需要修改成自己的
config.js ↓

module.exports = {
    // dbs: 'mongodb://139.159.253.110:27017/test1'
    dbs: 'mongodb+srv://xxwozixin:<需要修改>@cluster0-7d5kk.mongodb.net/test?retryWrites=true&w=majority'
}

user.js ↓

const router = require('koa-router')()
const User = require('../db/models/user')
router.prefix('/users')

router.get('/add', function (ctx, next) {
    ctx.body = 'this is a users/bar response'
})

router.get('/', function (ctx, next) {
  ctx.body = 'this is a users response!'
})

router.get('/bar', function (ctx, next) {
  ctx.body = 'this is a users/bar response'
})

module.exports = router

修改根目录app.js

const Koa = require('koa')
const app = new Koa()
const views = require('koa-views')
const json = require('koa-json')
const onerror = require('koa-onerror')
const bodyparser = require('koa-bodyparser')
const logger = require('koa-logger')

const index = require('./routes/index')
const users = require('./routes/users')


const mongoose = require('mongoose')
const dbconfig = require('./db/config')
mongoose.connect(dbconfig.dbs, {useNewUrlParser: true,useUnifiedTopology: true})
const db = mongoose.connection
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', function() {
  console.log('mongoose 连接成功')
});
// error handler
onerror(app)

// middlewares
app.use(bodyparser({
  enableTypes:['json', 'form', 'text']
}))
app.use(json())
app.use(logger())
app.use(require('koa-static')(__dirname + '/public'))

app.use(views(__dirname + '/views', {
  extension: 'pug'
}))

// logger
app.use(async (ctx, next) => {
  const start = new Date()
  await next()
  const ms = new Date() - start
  console.log(`${ctx.method} ${ctx.url} - ${ms}ms`)
})

// routes
app.use(index.routes(), index.allowedMethods())
app.use(users.routes(), users.allowedMethods())

// error-handling
app.on('error', (err, ctx) => {
  console.error('server error', err, ctx)
});

module.exports = app

// error handler
onerror(app)

// middlewares
app.use(bodyparser({
  enableTypes:['json', 'form', 'text']
}))
app.use(json())
app.use(logger())
app.use(require('koa-static')(__dirname + '/public'))

app.use(views(__dirname + '/views', {
  extension: 'pug'
}))

// logger
app.use(async (ctx, next) => {
  const start = new Date()
  await next()
  const ms = new Date() - start
  console.log(`${ctx.method} ${ctx.url} - ${ms}ms`)
})

// routes
app.use(index.routes(), index.allowedMethods())
app.use(users.routes(), users.allowedMethods())

// error-handling
app.on('error', (err, ctx) => {
  console.error('server error', err, ctx)
});

module.exports = app

重启项目
关掉前面我们启动的服务在运行

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