# app.js的onLaunch中   因為登錄是用戶感覺不到的
App({
  onLaunch: function () {
    let that = this
    // 登錄
    wx.login({
      success: res => {
        // 發(fā)送 res.code 到后臺換取 openId, sessionKey, unionId
        console.log(res.code)   //拿到code
        wx.request({
          url:that.globalData.baseurl+"/login/",
          data:{'code':res.code},
          method:'POST',
          success(e){
            console.log(e.data)
            // wx.setStorageSync("token", e.data.data.token)
            
          }
        })
      }
    })，
    globalData: {
    userInfo: null,
    baseurl:"http://127.0.0.1:8000"
  }
# dango后臺中
# urls.py 路由中
path('login/', user.Login.as_view()),
# user.py中
from rest_framework.views import APIView
from rest_framework.response import Response
from api.wx import wx_login
import hashlib, time
from django.core.cache import cache
from api.models import Wxuser
class Login(APIView):
    def post(self, request):
        param = request.data
        print(request.data)
        if not param.get('code'):
            return Response({"status": 1, "msg": '缺少參數(shù)'})
        else:
            code = param.get("code")
            user_data = wx_login.get_login_info(code)
            if user_data:
                val = user_data['session_key'] + "&" + user_data['openid']
                md5 = hashlib.md5()
                md5.update(str(time.clock()).encode("utf-8"))
                key = md5.hexdigest()
                cache.set(key, val)  # 放進(jìn)內(nèi)存redis庫中,把key傳給前端當(dāng)token.下次前臺帶著key就能拿到val
                has_user = Wxuser.objects.filter(openid=user_data['openid']).first()  # 判斷openid是否存在
                if not has_user:
                    Wxuser.objects.create(openid=user_data['openid'])
                return Response({
                    "status": 0,
                    "msg": "ok",
                    "data": {"token": key}
                })
            else:
                return Response({"status": 2, "data": "無效的code"})
# models.py中：
from django.db import models
class Wxuser(models.Model):
    id = models.AutoField(primary_key=True)
    openid=models.CharField(max_length=255)
    name = models.CharField(max_length=50)
    avatar = models.CharField(max_length=200)
    language = models.CharField(max_length=50)
    province = models.CharField(max_length=50)
    city = models.CharField(max_length=50)
    country = models.CharField(max_length=50)
    #gender = models.CharField(max_length=50)
    creat_time = models.DateTimeField(auto_now_add=True)
    update_time = models.DateTimeField(auto_now=True)
    def __str__(self):
        return self.openid
# settings.py中：自己注冊的微信小程序信息
AppId=""
AppSecret=""
code2Session="https://api.weixin.qq.com/sns/jscode2session?appid={}&secret={}&js_code={}&grant_type=authorization_code"
# wx_login.py中：
from api.wx import settings
import requests
def get_login_info(code):
    # 拼接路徑
    code_url = settings.code2Session.format(settings.AppId,settings.AppSecret,code)
    response = requests.get(code_url)  # 返回的是json數(shù)據(jù)
    json_response = response.json()    # 把json數(shù)據(jù)轉(zhuǎn)換為字典
    if json_response.get('session_key'):
        return json_response
    else:
        return False
# cache緩存配置redis數(shù)據(jù)庫