uniapp封装请求

封装请求有两种： 一种是在服务端判断token是否失效，一种是在小程序端判断token是否过期，，

第二种在前端判断要简单些，，在拿到token的时候，并在前端设置一个token的过期时间的毫秒值，约定为多久，，
前端发起请求的时候，先拿到这个时间做判断，判断token是否过期，如果过期，就去请求token，，请求完成之后再发起这个请求，，
如果没有过期，就直接发起请求，，

const BASE_URL = "http://localhost:8080"export const request = (options)=>{return new Promise((resolve, reject)=>{// 毫秒 ：令牌过期时间let login_expire_time = uni.getStorageSync("login_expire_time")if (login_expire_time && login_expire_time >new Date().getTime()){//handleRequest(options,resolve,reject)}else{console.log("ccccccc")uni.login({provider:"weixin",success:function (loginRes){uni.request({url:BASE_URL+"/mp/login",data:{code:loginRes.code},method:"POST",header:{"content-type":"application/x-www-form-urlencoded" // 将data当为key-value传递},success:(res)=>{console.log(res,"res")uni.setStorage({key:"userinfo",data:res.data.data,success:function (){// 登录完成之后，都去生成一个 login_expire_timeuni.setStorageSync("login_expire_time",new Date().getTime()+3600*1000)// 重新请求urlhandleRequest(options,resolve,reject)}})}})}})}})
}const handleRequest = (options,resolve,reject)=>{uni.request({url: BASE_URL + options.url,data:options.data,method: options.method,header: {"content-type": "application/json","mp_token":uni.getStorageSync("userinfo").session_key,"openid":uni.getStorageSync("userinfo").openid},success:function (res){resolve(res.data)},fail:function (err){reject(err)},complete:()=>{uni.hideLoading()}})
}

第一种是请求后端，令牌过期，会返回401，没有登录，，前端收到401错误码之后，再去重试这个请求

import {showCustomToast, toast} from "@/utils/utils";
import User from "@/model/User";const BASE_URL = "http://localhost:8082"/**** @param retryCount  重试次数 ，，401重试两次*/
function request({url,data,method="GET",retryCount=0}){console.log(data,"data",url)return new Promise((resolve, reject)=>{uni.request({url:BASE_URL+url,method:method,data:data,header:{"Authorization":`Bearer `+uni.getStorageSync("token")},success:(res)=>{// 判断code码if (res.statusCode === 200){if (res.data.code === 200){if (res.data.msg){toast(res.data.msg)}resolve(res.data.data)}else{if (res.data.msg){// toast(res.data.msg,"error")showCustomToast(res.data.msg)}resolve()}}else{// 服务器报错  400 500console.log(res,"res2342")if (res.statusCode===401){if (retryCount < 2){// 没有登录new Promise((resolve, reject)=>{uni.login({provider:"weixin",success:function (loginRes){console.log(loginRes.code)User.loginApi(loginRes.code).then(res=>{console.log(res,"res")uni.setStorageSync("token",res)resolve()})}})}).then(async res => {setTimeout(async () => {// 重发请求const result = await request({url, data, method, retryCount: retryCount + 1})console.log(result,"result")resolve(result)},1000)})}else{toast(res.data.msg,"error")reject()}}else{// 400 500toast(res.data.msg,"error")reject()}// if (res.data.msg){////     toast(res.data.msg,"error")// }}},fail:(err)=>{console.log(err,"err")reject(err)}})})
}export default request