vue/axios请求拦截

import axios from 'axios';//引入axios依赖
import { Message } from 'element-ui';
import Cookies from 'js-cookie';  //引入cookie操作依赖
import router from '@/router/index'//引入路由对象
axios.defaults.timeout = 5000;
axios.defaults.baseURL ='';

//http request 封装请求头拦截器

axios.interceptors.request.use(
    config => {
        var token = ''
        if(typeof Cookies.get('user') === 'undefined'){
            //此时为空
        }else {
            token = JSON.parse(Cookies.get('user')).token
        }//注意使用的时候需要引入cookie方法，推荐js-cookie
        config.data = JSON.stringify(config.data);
        config.headers = {
            'Content-Type':'application/json'
        }
        if(token != ''){
          config.headers.token = token;
        }
        return config;
    },
    error => {
        return Promise.reject(err);
    }
);

//http response 封装后台返回拦截器
axios.interceptors.response.use(
    response => {
        //当返回信息为未登录或者登录失效的时候重定向为登录页面
        if(response.data.code == 'W_100004' || response.data.message == '用户未登录或登录超时，请登录！'){
            router.push({
                path:"/",
                querry:{redirect:router.currentRoute.fullPath}//从哪个页面跳转
            })
        }
        return response;
    },
    error => {
        return Promise.reject(error)
    }
)

/**
 * 封装get方法
 * @param url
 * @param data
 * @returns {Promise}
 */

export function fetch(url,params={}){
    return new Promise((resolve,reject) => {
        axios.get(url,{
            params:params
        })
            .then(response => {
                resolve(response.data);
            })
            .catch(err => {
                reject(err)
            })
    })
}

/**
 * 封装post请求
 * @param url
 * @param data
 * @returns {Promise}
 */

export function post(url,data = {}){
    return new Promise((resolve,reject) => {
        axios.post(url,data)
            .then(response => {
                resolve(response.data);
            },err => {
                reject(err)
            })
    })
}
/**
 * 封装导出Excal文件请求
 * @param url
 * @param data
 * @returns {Promise}
 */

export function exportExcel(url,data = {}){
    return new Promise((resolve,reject) => {
        axios({
            method: 'post',
            url: url, // 请求地址
            data: data, // 参数
            responseType: 'blob' // 表明返回服务器返回的数据类型
        })
        .then(response => {
            resolve(response.data);
            let blob = new Blob([response.data], {type: "application/vnd.ms-excel"});
            let fileName = "订单列表_"+Date.parse(new Date())+".xls" ;
            if (window.navigator.msSaveOrOpenBlob) {
                navigator.msSaveBlob(blob, fileName);
            } else {
                var link = document.createElement('a');
                link.href = window.URL.createObjectURL(blob);
                link.download = fileName;
                link.click();
                window.URL.revokeObjectURL(link.href);
            }
        },err => {
            reject(err)
        })
    })
}
/**
 * 封装patch请求
 * @param url
 * @param data
 * @returns {Promise}
 */

export function patch(url,data = {}){
    return new Promise((resolve,reject) => {
        axios.patch(url,data)
            .then(response => {
                resolve(response.data);
            },err => {
                reject(err)
            })
    })
}

/**
 * 封装put请求
 * @param url
 * @param data
 * @returns {Promise}
 */

export function put(url,data = {}){
    return new Promise((resolve,reject) => {
        axios.put(url,data)
            .then(response => {
                resolve(response.data);
            },err => {
                reject(err)
            })
    })
}