vue下axios拦截器token刷新机制

//创建http.js文件，以下是具体代码：



//引入安装的axios插件
import axios from ‘axios‘
import router from ‘@/router‘;
import Vue from ‘vue‘
const qs = require("qs");
let _this = new Vue();
let isLock = false;
let refreshSubscribers = [];
//判断token是否过期
function isTokenExpired(token) {
  let expires_time = JSON.parse(token).expires_time;
  let curentTime = new Date().getTime();
  if (curentTime >= expires_time) {
    return true;
  } else {
    return false;
  }
}
//获取Token对象
function getToken() {
  return localStorage.getItem("token");
}
//push所有请求到数组中
function subscribeTokenRefresh(cb) {
  refreshSubscribers.push(cb)
}

//刷新请求（refreshSubscribers数组中的请求得到新的token之后会自执行，用新的token去请求数据）
function onRrefreshed(token) {
  refreshSubscribers.map(cb => cb(token))
}
//刷新token
function refreshToken(config, token, resolve, reject) {
  let data = { refresh_token: JSON.parse(token).refresh_token };
  axios({
    method: "post",
    url: "xxxxxx/refreshToken",//刷新token的接口
    headers: {
      "Content-Type": "application/x-www-form-urlencoded",
      "Authorization": "Basic b3JkZXItc2VydmVyOjEyMzQ1Ng=="
    },
    data: qs.stringify(data)
  }).then(res => {
    isLock = false;//释放锁
    if (res.data.code === 101) {
      _this.$message.error(‘登录状态已失效，请重新登录。‘);
      localStorage.removeItem("token");
      router.push({
        path: "/login"
      });
      return;
    }

    let expires_time = new Date().getTime() + parseInt(res.data.data.expires_in * 0.8) * 1000;
    let token = JSON.parse(localStorage.getItem("token"));
    token.expires_time = expires_time;
    token.access_token = res.data.data.access_token;
    localStorage.setItem("token", JSON.stringify(token));

    config.headers.Authorization = ‘Bearer ‘ + res.data.data.access_token;
    resolve(config);
    //执行数组里的函数,重新发起被挂起的请求
    onRrefreshed(res.data.data.access_token)
    //清空数组中保存的请求
    refreshSubscribers = []
  }).catch(err => {
    return err;
  });
}

function request(newOptions, resolve, reject) {
  axios({
    method: newOptions.method,
    url: newOptions.url,
    data: newOptions.type == "form" ? qs.stringify(newOptions.data) : newOptions.data,
    headers: newOptions.headers
  }).then(res => {
    if (res.status == 200) {
      //这里我们只需要获取返回的data中的数据即可
      resolve(res.data);
    } else {
      reject(res.data);
    }
  }).catch(err => {
    reject(err);
    _this.$message.error(‘服务异常！‘);
  })
}

axios.interceptors.request.use(
  config => {
    let token = getToken();
    if (token) {
      //判断token是否过期,如果过期请求刷新token
      if (isTokenExpired(token)) {
        //判断当前是否正在请求刷新token
        if (!isLock) {
          isLock = true;//isLock设置true,锁住防止死循环。
          //使用Promise等待刷新完成返回配置信息
          let refresh = new Promise((resolve, reject) => {
            refreshToken(config, token, resolve, reject);
          })
          return refresh;

        } else {
          //判断当前url是否是刷新token的请求地址，如果是直接下一步。
          if (config.url.indexOf(‘/logined/refreshToken‘) === -1) {
            //把请求(token)=>{....}都push到一个数组中
            let retry = new Promise((resolve, reject) => {
              //(token) => {...}这个函数就是回调函数
              subscribeTokenRefresh((token) => {
                config.headers.Authorization = ‘Bearer ‘ + token
                //将请求挂起
                resolve(config)
              })
            })
            return retry

          } else {
            return config;
          }
        }

      } else {
        return config;
      }

    } else {
      return config;
    }
  }, error => {
    return Promise.reject(error);
  });
const http = options => {
  return new Promise((resolve, reject) => {
    const defaultOptions = {
      type: "json"
    };
    const newOptions = {
      ...defaultOptions,
      ...options
    };
    //headers默认传递json格式数据，这里也可以设置token，每次调用都会携带
if (localStorage.getItem("token")) {
        newOptions.headers = {
          // ‘Authorization‘: ‘Basic b3JkZXItc2VydmVyOjEyMzQ1Ng==‘,
          ‘content-Type‘: newOptions.type == ‘form‘ ? ‘application/x-www-form-urlencoded;charset=UTF-8‘ : ‘application/json;charset=UTF-8‘,
          ‘Authorization‘: ‘Bearer ‘ + JSON.parse(localStorage.getItem("token")).access_token,
          ...newOptions.headers
        };
      } else {
        newOptions.headers = {
          ‘content-Type‘: newOptions.type == ‘form‘ ? ‘application/x-www-form-urlencoded;charset=UTF-8‘ : ‘application/json;charset=UTF-8‘,
          ...newOptions.headers
        };
      }
    request(newOptions, resolve, reject);
  })
};

//设置请求超时
axios.defaults.timeout = 30000
export default http

//在main.js下面挂载 http.js文件
import http from ‘@/utils/http.js‘;
Vue.prototype.http = http;

//登录保存token信息接口

this.http({
            method: "post",
            url: "/xxxxx/user",
            type: "form",
            headers: { Authorization:"Basicb3JkZXItc2VydmVyOjEyMzQ1Ng==" },
            data: {}
          }).then(function(res) {
               let expires_time =
                  new Date().getTime() +
                  parseInt(res.data.token.expires_in * 0.8) * 1000;
                  let token = res.data.token;
                  token.expires_time = expires_time;
                localStorage.setItem("token", JSON.stringify(token));
        
            }).catch(function(err) {
              console.log(err);
            });                

//退出清空token
this.http({
        method: "get",
        url: "/xxxxx/logout",
        data: {}
      }).then(function(res) {
 localStorage.removeItem("token");
    }).catch(function(err) {
          console.log(err);
        });