vue 微信授权登录解决方案

async ReturnGetCodeUrl() {
  let {
    data
  } = await getWxAuth({});
  if (data.status == 200) {
    window.location.href = data.url;

    // 返回的结果
    // redirect_uri重定向的url是后台的地址，后台就是可拿到code，获取token
    // https://open.weixin.qq.com/connect/oauth2/authorizeappid=xxxxxxxxxxxxxxxxxx&redirect_uri=***url***&response_type=code&scope=snsapi_userinfo&state=STATE&connect_redirect=1#wechat_redirect
    
  }
 },

 router.beforeEach((to, from, next) => {
   //  第一次进入项目
   let token = window.localStorage.getItem("user_token");
   
   if (!token && to.path != "/author") {
    window.localStorage.setItem("beforeLoginUrl", to.fullPath); // 保存用户进入的url
    next("/author");
    return false;
   } else if (token && !store.getters.userInfo) {
   //获取用户信息接口
    store
     .dispatch("GetUserInfo", {
      user_token: token
     })
     .catch(err => {
      window.localStorage.removeItem("user_token");
      router.go(0);
      return false;
     });
   }
   next();
  });

<template>
  <div>
授权中。。。
  </div>
</template>

<script>
 
  import {
   getWxAuth
  } from '@/service/getData'
  import {
   GetQueryString 
  } from '@/utils/mixin';
  export default {
   data() {
     return {
      token: '',
     };
   },
   computed: {
    
   },
   created() {
     this.token = window.localStorage.getItem("user_token");
     //判断当前的url有没有token参数,如果不存在那就跳转到微信授权的url
     //就是前面说的ReturnGetCodeUrl方法
 
     if (!GetQueryString("token")) {
      this.ReturnGetCodeUrl();
     } else {
      //如果有token，如http://www.xxxx.com/h5/author?token=xxxxxxxxx&msg=200，这里的参数就是后台重定向到前台http://www.xxxx.com/h5/author，并携带的参数。这样就可以拿到我们想要的token了
      //判断一下后台返回的状态码msg，因为可能出现微信拿不到token的情况
      let msg = GetQueryString("msg")
      if (msg = 200) {
        this.token = GetQueryString("token");
        //存储token到本地
        window.localStorage.setItem("user_token", this.token);
        //获取beforeLoginUrl，我们的前端页面
        let url = window.localStorage.getItem("beforeLoginUrl");
        //跳转
        this.$router.push(url);
        //删除本地beforeLoginUrl
        removeLocalStorage("beforeLoginUrl");
      }else{
      //msg不是200的情况，可能跳到404的错误页面
      }
     }
   },
   methods: {
    
     async ReturnGetCodeUrl() {
      let {
        data
      } = await getWxAuth({});
      if (data.status == 200) {
       
        window.location.href = data.url;
      }
     },

     
   },
   watch: {},

   components: {},


   mounted: function () {}
  }
</script>
<style lang='scss' scoped>

</style>

export const GetQueryString = name => {
 var url = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");
 var newUrl = window.location.search.substr(1).match(url);
 if (newUrl != null) {
  return unescape(newUrl[2]);
 } else {
  return false;
 }
};