wx.getStorage（wx.getStorageSync）、 
wx.clearStorage（wx.clearStorageSync） 

wx.setStorage({
 key:"key",
 data:"value",
 success:function(res){console.log(res)},
 fail:function(res){console.log(res)},
 complete:function(res){console.log(res)},
})
//Object {errMsg: "setStorage:ok"}
//Object {errMsg: "setStorage:ok"}

wx.setStorageSync('key', 'value')

wx.setStorage({key:"ob",data:{name:'smallerpig',sex:1,age:18}})

wx.getStorage(
{
 key:'key',
 success:function(res){
  console.log(res)//Object {errMsg: "getStorage:ok", data: "value1"}
 },
 fail:function(res){console.log(res)},
 complete:function(res){console.log(res)}
})

wx.getStorageSync('ob')
//Object {name: "smallerpig", sex: 1, age: 18}

wx.getStorageInfo({
 success: function(res) {
 console.log(res.keys)
 console.log(res.currentSize)
 console.log(res.limitSize)
 }
//["logs", "r3session", "key"]0: "logs"1: "r3session"2: "key"]
//1
//10240
})

@app.route('/user/getuserinfo', methods=['GET', 'POST'])
def getuserinfo():
 code = request.data
 url = 'https://api.weixin.qq.com/sns/jscode2session"htmlcode">

wx.request({
 url: 'https://***.smallerpig.com/user/getuserinfo',
 data: r.code,
 method: 'POST',
 success: function(res){
 wx.setStorageSync('r3session', res.data)
 }
})



再接下来，在调用wx.getUserInfo时将返回的数据加上从微信小程序本地缓存中取到的r3session丢给flask来处理，flask根据来的r3session从本地服务器的flask缓存中取到微信的值解密cryptedData。这才是一个完整的过程。 


小程序的getUserInfo代码： 




wx.getUserInfo({
 success: function (res) {
 that.globalData.userInfo = res.userInfo
 typeof cb == "function" && cb(that.globalData.userInfo)
 //将本地存储中的r3session值也同样传递到我的服务器，在服务器中找出微信给到我们的session_key
 var r3session = wx.getStorageSync('r3session')
 res.r3session = r3session
 wx.request({
  url: 'https://***.smallerpig.com/user/getuserunionid',
  data: res,
  success: function(res){
  // success
  console.log(res)
  },
 })
 }
})



对应的flask代码：


@app.route('/user/getuserunionid', methods=['GET', 'POST'])
def getuserid():
 r = json.loads(request.data)
 encryptedData = r['encryptedData']
 iv = r['iv']
 xcx_session_key = r['r3session']
 session_key = cache.get(xcx_session_key) # 从缓存中取出对应r3session对应的session_key
 pc = WXBizDataCrypt(appid, session_key)
 return pc.decrypt(encryptedData, iv)



参考官方文档地址：https://mp.weixin.qq.com/debug/wxadoc/dev/api/data.html
总结
经过几篇文章的介绍，如果您是按照小猪的代码一步一步做的话你应该已经了解小程序开发的大致过程，接下来的重点无非就是熟悉小程序提供给大家的接口，然后根据这些接口来完善我们的业务逻辑。
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