vue-cli 2.x連多個後臺&前端使用proxyTable解決跨域問題

零、axios模塊引入

npm install axios

然後在你需要的地方開頭寫 import axios from 'axios'即可，我這裏是在axios/index.js裏面使用了，全部代碼看下面。

一、axios二次封裝

要想連兩個後臺，原理就是在vue-cli配置文件中封裝axios的地方創建兩個axios實例，然後在你寫的接口api位置調用具體的某個axios即可。所以我們首先先封裝axios，我這裏是封裝在了axios/index.js裏面的，全部代碼如下：

import axios from 'axios'
import store from '@/store'
import router from '../router'
import sessionStorage from '@/utils/sessionStorage'
function request(config){
    //1.創建axios實例
    const instance1 = axios.create({
        baseURL:"http://11.1.1.11:8086/la", //我隨便編的url地址
        timeout: 5000
    })

    const instance2 = axios.create({
        baseURL:"http://22.2.2.22:8080/zhou",//我隨便編的url地址
        timeout: 50000
    })
    //request攔截器
    instance1.interceptors.request.use(
        config => {
            //每次發送請求之前檢測都vuex存有token,那麼都要放在請求頭髮送給服務器
            if(store.getters.token){
                config.headers.Authorization = store.getters.token;
            }
            return config;
        },
        err => {
            return Promise.reject(err);
        }
    );
    //respone攔截器
    instance1.interceptors.response.use(
        response => {
            if(response){
                if(response.data.data == 10001){
                    store.dispatch('UserLogout')
                    router.replace({
                        path:'/login',
                        query:{
                            redirect: router.currentRoute.fullPath
                        }
                    })
                }
                
            }
            return response;
        },
        error => { //默認除了2XX之外的都是錯誤的，就會走這裏
            if(error.response){
                switch(error.response.status){
                    case 401:
                        store.dispatch('UserLogout'); //可能是token過期，清除它
                        router.replace({ //跳轉到登錄頁面
                            path: 'login',
                            query: { redirect: router.currentRoute.fullPath } // 將跳轉的路由path作爲參數，登錄成功後跳轉到該路由
                        });
                }
            }
            return Promise.reject(error.response);
        }
    );
    //發送真正的網絡請求
    return [instance1,instance2]
}
export default request()


   

如果你不對實例進行攔截器處理，簡化以後就是這樣的：

import axios from 'axios'
import store from '@/store'
import router from '../router'
import sessionStorage from '@/utils/sessionStorage'
function request(config){
    //1.創建axios實例
    const instance1 = axios.create({
        baseURL:"http://11.1.1.11:8086/la", //我隨便編的url地址
        timeout: 5000
    })

    const instance2 = axios.create({
        baseURL:"http://22.2.2.22:8080/zhou",//我隨便編的url地址
        timeout: 50000
    })
    //發送真正的網絡請求
    return [instance1,instance2]
}
export default request()


   

二、接收實例

兩個實例都暴露出來了，你只需要在你代碼封裝接口的api裏（我這裏是在api/area.js裏面）指定具體的實例即可。代碼如下

import request  from '../axios'; //首先得引入axios/index.js裏面的實例request
export default{
    queryIcAreaInfoList(data){
        return request[1]({ //這裏使用的是axios/index.js裏面的第二個baseURL
            url:'/area/queryIcAreaInfoList',
            method:'post',
            data:data
        })
    },
    bookroom(data){
        return request[0]({ //這裏使用的是axios/index.js裏面的第一個baseURL
            url:'/bookroom/insert',
            method:'post',
            data:data
        })
    },
}

然後在你.vue代碼裏面調用你需要的接口就可以了

<script>
import area from "@/api/area.js"
export default {
  data() {
    return {
    }
  },
  activated() {
      this.getList(this.currentPage,this.pageSize)
  },
  methods: {
      getList(cur,size) {
          let obj = {}
          area.queryIcAreaInfoList(obj).then(res => {
              console.log('看看多後臺行不',res)
          })
      },

  }
}
</script>

至此就完成了一個前端調用多個後臺的操作啦，是不是很簡單~

 

下面我們解決一下跨域問題。

就拿上面的例子舉例，如果我們實例化的instance2存在跨域問題，那麼我們需要使用proxyTable來解決。需要改的地方如下：

首先，在axios/index.js裏面把instance2的baseURL改爲隨便一個單詞，我這裏爲“/api"：

import axios from 'axios'
import store from '@/store'
import router from '../router'
import sessionStorage from '@/utils/sessionStorage'
function request(config){
    //1.創建axios實例
    const instance1 = axios.create({
        baseURL:"http://11.1.1.11:8086/la", //我隨便編的url地址
        timeout: 5000
    })

    const instance2 = axios.create({
        baseURL:"/api",//用/api來替代我們要訪問的url地址
        timeout: 50000
    })
    //發送真正的網絡請求
    return [instance1,instance2]
}
export default request()

然後，在config/index.js文件裏面配置proxyTable，完整代碼如下：

'use strict'
// Template version: 1.3.1
// see http://vuejs-templates.github.io/webpack for documentation.

const path = require('path')

module.exports = {
  dev: {

    // Paths
    assetsSubDirectory: 'static',
    assetsPublicPath: '/',
    proxyTable: {
      '/api': {
        target:'http://22.2.2.22:8080/zhou', //這裏就是剛剛用api替換的url地址
        changeOrigin: true,
        withCredentials:true,
        pathRewrite: {
          '^/api': ''
        }
      }
    },

    // Various Dev Server settings
    host: 'localhost', // can be overwritten by process.env.HOST
    port: 8080, // can be overwritten by process.env.PORT, if port is in use, a free one will be determined
    autoOpenBrowser: false,
    errorOverlay: true,
    notifyOnErrors: true,
    poll: false, // https://webpack.js.org/configuration/dev-server/#devserver-watchoptions-

    
    /**
     * Source Maps
     */

    // https://webpack.js.org/configuration/devtool/#development
    devtool: 'cheap-module-eval-source-map',

    // If you have problems debugging vue-files in devtools,
    // set this to false - it *may* help
    // https://vue-loader.vuejs.org/en/options.html#cachebusting
    cacheBusting: true,

    cssSourceMap: true
  },

  build: {
    // Template for index.html
    index: path.resolve(__dirname, '../dist/index.html'),

    // Paths
    assetsRoot: path.resolve(__dirname, '../dist/'),
    assetsSubDirectory: 'static',
    assetsPublicPath: './',

    /**
     * Source Maps
     */

    productionSourceMap: true,
    // https://webpack.js.org/configuration/devtool/#production
    devtool: '#source-map',

    // Gzip off by default as many popular static hosts such as
    // Surge or Netlify already gzip all static assets for you.
    // Before setting to `true`, make sure to:
    // npm install --save-dev compression-webpack-plugin
    productionGzip: false,
    productionGzipExtensions: ['js', 'css'],

    // Run the build command with an extra argument to
    // View the bundle analyzer report after build finishes:
    // `npm run build --report`
    // Set to `true` or `false` to always turn it on or off
    bundleAnalyzerReport: process.env.npm_config_report
  }
}

你的配置可以和我的有些區別，但是需要更改的其實只是這一段（注意target的url一定要以http://開頭的哦）：

    proxyTable: {
      '/api': {
        target:'http://22.2.2.22:8080/zhou', //這裏就是剛剛用api替換的url地址
        changeOrigin: true,
        withCredentials:true,
        pathRewrite: {
          '^/api': ''
        }
      }

然後調用啥的都不用改，只需要改着兩個位置就可解決跨域問題，如果多個後臺url都有跨域問題，那麼就在proxyTable多加幾個，做成列表就可以啦。