微信小程序API-微信运动
https://mp.weixin.qq.com/debug/wxadoc/dev/api/we-run.html#wxgetwerundataobject

思路：wx.login获取的code请求获取的session_key，wx.getWeRunData获取的iv,encryptData，将它们一起发送到后台解密就行了。

安全顾虑，因为只是示例所以直接传递session_key了，为了安全最好按照下图的方式加密后存储到redis中再传递key。

小程序端代码

get3rdSession: function () {    let that = this    wx.request({      url: 'https://localhost/login.php',      data: {        code: this.data.code      },      method: 'GET', // OPTIONS, GET, HEAD, POST, PUT, DELETE, TRACE, CONNECT      success: function (res) {        var sessionId = res.data;        that.setData({ sessionId: sessionId })        wx.setStorageSync('sessionId', sessionId)        that.decodeUserInfo()      }    })  },  decodeUserInfo: function () {    let that = this    wx.request({      url: 'https://localhost/decrypt.php',      data: {        encryptedData: that.data.encryptedData,        iv: that.data.iv,        session: wx.getStorageSync('sessionId')      },      method: 'GET', // OPTIONS, GET, HEAD, POST, PUT, DELETE, TRACE, CONNECT      // header: {}, // 设置请求的 header      success: function (res) {        let todayStep = res.data.stepInfoList.pop()        that.setData({          step: todayStep.step        });      }    })  },  onLoad: function () {    let that = this    wx.login({      success: function (res) {        let code = res.code        that.setData({ code: code })        wx.getWeRunData({//解密微信运动          success(res) {            const wRunEncryptedData = res.encryptedData            that.setData({ encryptedData: wRunEncryptedData })            that.setData({ iv: res.iv })            that.get3rdSession()//解密请求函数          }        })      }    })  }

后台这使用的是官方PHP版本Demo：先处理login的请求，login.php直接返回session_key，然后再一起请求decrypt.php进行解密。

login.php部分代码

$appid = '你的appid';$appsecret = '你的appsecret';$url = 'https://api.weixin.qq.com/sns/jscode2session?appid='.$appid.'&secret='.$appsecret.'&js_code='.$_GET['code'].'&grant_type=authorization_code';$content = file_get_contents($url);$content = json_decode($content);echo $content-session_key;

decrypt.php部分代码

$pc = new WXBizDataCrypt($appid, $sessionKey);$errCode = $pc-decryptData($encryptedData, $iv, $data );if ($errCode == 0) {    print($data . "");} else {    print($errCode . "");}

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