vue的接口封装和状态管理

1.config index.js下面的跨域代理设置:

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proxyTable: {
      '/api': {
        target: 'http://xxxx', //要访问的后端接口
        changeOrigin: true,
        pathRewrite: {
          '^/api': 'http://xxx'
        }
      },
    },
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2.http.js(封装axios)

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import Vue from 'vue'
import axios from 'axios'
import QS from 'qs' //视情况用于不用;
import { Loading, Message } from 'element-ui';
import store from '../store/index'

let loading //定义loading变量

function startLoading() { //使用Element loading-start 方法
  loading = Loading.service({
    lock: true,
    text: '努力加载中……',
    background: 'rgba(0, 0, 0, 0.5)'
  })
}

function endLoading() { //使用Element loading-close 方法
  loading.close()
}

//那么 showFullScreenLoading() tryHideFullScreenLoading() 要干的事儿就是将同一时刻的请求合并。
//声明一个变量 needLoadingRequestCount,每次调用showFullScreenLoading方法 needLoadingRequestCount + 1。
//调用tryHideFullScreenLoading()方法,needLoadingRequestCount - 1。needLoadingRequestCount为 0 时,结束 loading。
let needLoadingRequestCount = 0
export function showFullScreenLoading() {
  if (needLoadingRequestCount === 0) {
    startLoading()
  }
  needLoadingRequestCount++
}

export function tryHideFullScreenLoading() {
  if (needLoadingRequestCount <= 0) return
  needLoadingRequestCount--
  if (needLoadingRequestCount === 0) {
    endLoading()
  }
}

let baseWebURL = '';
// 环境的切换
if (process.env.NODE_ENV == 'development') { //开发环境   
  baseWebURL = '/api' + '/api';(多加一个api是后台那边统一拦截处理视项目情况而定加不加)
} else if (process.env.NODE_ENV == 'test') { //测试环境
  baseWebURL = 'https://www.test.com';
} else if (process.env.NODE_ENV == 'production') { //生产环境
  baseWebURL = 'http://www.producetion.com';
}
//生成一个axios实例
var instance = axios.create({
  baseURL: baseWebURL,
});
console.log(instance, 'instance')
//1.请求超时时间
instance.defaults.timeout = 10000;
//2.post请求头 
instance.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded;charset=UTF-8';
//3.公共部分(请求带token设置)
//instance.defaults.headers.common['Authorization'] = store.state.token;
//4.返回数据类型的定义
//instance.defaults.responseType = 'json';
//5.带cookie请求
instance.defaults.withCredentials = true

// 请求拦截器
instance.interceptors.request.use(
  config => {
    console.log(config, 'config请求拦截器')
    //1.全局loadin配置
    /*2.token校验:一般是在登录完成之后,将用户的token通过localStorage或者cookie存在本地;
    然后用户每次在进入页面的时候(即在main.js中),会首先从本地存储中读取token;
    如果token存在说明用户已经登陆过则更新vuex中的token状态;
    然后,在每次请求接口的时候,都会在请求的header中携带token;
    后台人员就可以根据你携带的token来判断你的登录是否过期,如果没有携带,则说明没有登录过。
    v1.每次发送请求之前判断vuex中是否存在token        
    v2.如果存在,则统一在http请求的header都加上token,这样后台根据token判断你的登录情况
    v3.即使本地存在token,也有可能token是过期的,所以在响应拦截器中要对返回状态进行判断*/
    const token = store.state.token;
    alert(token,'token')        
    token && (config.headers.Authorization = token);
    if (config.method == 'post') {
      console.log('post请求统一需要做什么判断')
    }
    //config.headers.Accept = 'application/json'; //规定接受形式json格式
    showFullScreenLoading() //开启loading
    return config;
  }, error => {
    return Promise.reject(error);
  });

// 响应拦截器
instance.interceptors.response.use(
  response => {
    console.log(response, 'response响应拦截器')
    // 如果返回的状态码为200,说明接口请求成功,可以正常拿到数据     
    //否则的话抛出错误
    if (response.status === 200) {
      tryHideFullScreenLoading() //关闭loading
      Message({
        showClose: true,
        message: '响应成功',
        type: 'success'
      })
      return Promise.resolve(response);
    } else {
      return Promise.reject(response);
    }
  }, error => {
    console.log(error, 'error')
    if (error.response.data.status) {
      console.log('后台错误码统一处理')
      switch (error.response.data.status) {
        // 401:未登录;未登录则跳转登录页面,并携带当前页面的路径;在登录成功后返回当前页面,这一步需要在登录页操作。                
        case 401:
          router.replace({
            path: '/login',
            query: {
              redirect: router.currentRoute.fullPath
            }
          });
          break;
        // 403:token过期;登录过期对用户进行提示;清除本地token和清空vuex中token对象;跳转登录页面                
        case 403:
          Message({
            showClose: true,
            message: '登录过期,请重新登录',
            duration: 1000,
            type: 'warning'
          })
          //清除token
          localStorage.removeItem('userToken');
          store.commit('LOGIN_OUT', null);
          //跳转登录页面,并将要浏览的页面fullPath传过去,登录成功后跳转需要访问的页面 
          setTimeout(() => {
            router.replace({
              path: '/login',
              query: {
                redirect: router.currentRoute.fullPath
              }
            });
          }, 1000);
          break;
        //404请求不存在
        case 404:
          Message({
            showClose: true,
            message: '网络请求不存在',
            duration: 1000,
            type: 'error'
          })
          break;
        //其他错误,直接抛出错误提示
        default:
          Message({
            showClose: true,
            message: error.response.data.message,
            duration: 1000,
            type: 'error'
          })
      }
    }
    return Promise.reject(error);
  });


// 封装axios的get请求
export function getData(url, params) {
  return new Promise((resolve, reject) => {
    instance.get(url, params).then(response => {
        resolve(response.data);
      })
      .catch(error => {
        reject(error);
      });
  });
}
// 封装axios的post请求
export function postData(url, params) {
  return new Promise((resolve, reject) => {
    instance.post(url, QS.stringify(params)).then(response => {
        resolve(response.data);
      })
      .catch(error => {
        reject(error);
      });
  });
}
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3.api.js(封装接口)

import { postData, getData } from './http.js'

export function cityList(data = {}) {
  return postData('/xxxx/xx', data);
}

4.vuex构成

(1)index.js

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import Vue from 'vue';
import Vuex from 'vuex';
import state from './state'
import mutations from './mutations'
import getters from './getters'
import actions from './actions'
Vue.use(Vuex);

const store = new Vuex.Store({
  state,
  mutations,
  getters,
  actions
});

export default store;
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(2)state.js

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export default {
  state: {
    // 存储token
    token: localStorage.getItem('userToken') ? localStorage.getItem('userToken') : ''
  }
}
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(3)mutation-types.js (常量)

export const LOGIN_IN = 'LOGIN_IN';//登入
export const LOGIN_OUT = 'LOGIN_OUT';//登出

(4)mutation.js

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import * as type from './mutation-types'
export default {
  //登入
  [type.LOGIN_IN](state, token) {
    state.token = token;
    localStorage.setItem('userToken', token);
  },
  //登出 or 退出登入
  [type.LOGIN_OUT](state, token) {
    localStorage.removeItem("userToken", token);
    state.token = token;
  },
}
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(5)actions (这里是异步操作)

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export default{
    //actions这里提交的是mutation
    getLoginInInfo({commit},token){
        commit('LOGIN_IN',token)
    },
    getLoginOutInfo({commit},token){
        commit('LOGIN_OUT',token)
    }
}
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(6)getters.js  视情况放什么获取state更改后的值

(7)路由 router下面的index.js

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import Vue from 'vue'
import Router from 'vue-router'
import store from '../store/index'
//方式一:最简单直接的使用组件
//import HelloWorld from '@/components/HelloWorld'
//import Test from '@/components/test'

//方式二:webpack自带的模块按需加载 r就是resolve
//const HelloWorld = r => require.ensure([], () => r(require('@/components/HelloWorld')), 'HelloWorld');

Vue.use(Router)

const router = new Router({
  mode: 'history', //去掉地址栏#号
  routes: [{
    path: '/',
    name: 'testMain',
    meta: {
      title: '系统首页',
      requireAuth: true, // 添加该字段,表示进入这个路由是需要登录的
    },
    component: resolve => require(['@/components/testMain'], resolve) //测试首页
  }, {
    path: '/login',
    name: 'login',
    meta: {
      title: '登入',
    },
    component: resolve => require(['@/components/login'], resolve) //模拟登入------(方式三:懒加载方式)
  }, {
    path: '/HelloWorld',
    name: 'HelloWorld',
    meta: {
      requireAuth: true,
      title: '测试二级联动路由传参',
    },
    component: resolve => require(['@/components/HelloWorld'], resolve) //测试二级联动路由传参
  }, {
    path: '/test',
    name: 'test',
    meta: {
      requireAuth: true,
      title: '测试参数解码',
    },
    component: resolve => require(['@/components/test'], resolve) //测试参数解码
  }, {
    path: '/testEgdit',
    name: 'testEgdit',
    meta: {
      requireAuth: true,
      title: '富文本编辑器试用',
    },
    component: resolve => require(['@/components/testEgdit'], resolve) //富文本编辑器试用
  }, {
    path: '/testElementComponent',
    name: 'testElementComponent',
    meta: {
      requireAuth: true,
      title: 'element ui组件测试',
    },
    component: resolve => require(['@/components/testElementComponent'], resolve) //element ui 组件测试
  }, {
    path: '/tableTest',
    name: 'tableTest',
    meta: {
      requireAuth: true,
      title: 'element ui表格组件测试',
    },
    component: resolve => require(['@/components/tableTest'], resolve) //element ui table组件测试
  }, {
    path: '/echartTest',
    name: 'echartTest',
    meta: {
      requireAuth: true,
      title: 'echart插件测试',
    },
    component: resolve => require(['@/components/echartTest'], resolve) //echart插件测试
  }, {
    path: '*',
    name: 'notFound',
    meta: {
      title: '404页面',
    },
    component: resolve => require(['@/components/notFound'], resolve) //全不匹配的情况下,返回404,路由按顺序从上到下,依次匹配。最后一个*能匹配全部
  }]
})

router.beforeEach((to, from, next) => {
  //可以做 loadong 开始加载 效果
  store.state.token = localStorage.getItem('userToken'); //获取本地存储的token
  if (to.meta.title) { //判断是否有标题  该操作可以再监听路由时候处理 watch:{'$route'(to,from){xxx操作}}
    document.title = to.meta.title
  }
  if (to.meta.requireAuth) { // 判断该路由是否需要登录权限
    if (store.state.token) { // 通过vuex state获取当前的token是否存
      console.log('有token时候', to, from, next)
      next();
    } else {
      console.log('没有token时候', to)
      next({
        path: '/login',
        query: { redirect: to.fullPath } // 将跳转的路由path作为参数,登录成功后跳转到该路由
      })
    }
  } else {
    next();
  }
})

router.afterEach(route => {
  //loading加载完成
});

export default router;

转载于:https://www.cnblogs.com/tomofagain/p/10972247.html

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