基于vue+element实现全局loading过程详解

//全局页面跳转是否启用loading
export const routerLoading = true;

//全局api接口调用是否启用loading
export const apiLoading = true;

//loading参数配置
export const loadingConfig = {
 lock: true,
 text: 'Loading',
 spinner: 'el-icon-loading',
 background: 'rgba(0, 0, 0, 0.7)'
}

import ElementUI from 'element-ui';
import {loadingConfig} from '../src/config/index' //全局的一个基本参数配置

var loading = null ;
const loadingShow = () => {
 loading = ElementUI.Loading.service(loadingConfig);
}

const loadingHide = () => {
 loading.close();
}

const loadingObj={
 loadingShow,
 loadingHide
}

export default loadingObj

// The Vue build version to load with the `import` mand
// (runtime-only or standalone) has been set in webpack.base.conf with an alias.
import Vue from 'vue'
import App from './App'
import router from './router'
import ElementUI from 'element-ui';
import 'element-ui/lib/theme-chalk/index.css';

import glo_loading from '../loading/index' //loading组件的简单封装
import {routerLoading} from '../src/config/index' //全局的页面跳转loading是否启用

Vue.use(ElementUI);

Vue.config.productionTip = false

/ eslint-disable no-new /
new Vue({
 el: '#app',
 router,
 ponents: { App },
 template: '<App/>'
})

//从后台获取的用户角色
const role = 'user'
//当进入一个页面是会触发导航守卫 router.beforeEach 事件
router.beforeEach((to,from,next) => {
 routerLoading ? glo_loading.loadingShow() : '' //如果全局启用页面跳转则加载loading
 if(to.meta.roles){
  if(to.meta.roles.includes(role)){
   next() //放行
  }else{
   next({path:"/404"}) //跳到404页面
  }
 }else{
  next() //放行
 }
routerLoading ? glo_loading.loadingHide() : ''//关闭loading层
})

// 添加请求拦截器
service.interceptors.request.use(function (config) {
 // 在发送请求之前做些什么
 apiLoading ? glo_loading.loadingShow() : ''//全局loading是否启用
 return config;
}, function (error) {
 // 对请求错误做些什么
 console.log(error);
 return Promise.reject(error);
});

// 添加响应拦截器
service.interceptors.response.use(function (response) {
 // 对响应数据做点什么
 if(response.status == 200){
   return response.data;
 }else{
  Promise.reject();
 }
}, function (error) {
 // 对响应错误做点什么
 console.log(error);
 apiLoading ? glo_loading.loadingHide() : ''
 return Promise.reject(error);
});