现在运动计步很火，无论是蚂蚁森林，还是微信上都很火爆，本文介绍了微信小程序微信运动步数的实例代码，分享给大家

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

1. get3rdSession: function () {
2. let that = this
3. wx.request({
4. url: 'https://localhost/login.php',
5. data: {
6. code: this.data.code
7. },
8. method: 'GET', // OPTIONS, GET, HEAD, POST, PUT, DELETE, TRACE, CONNECT
9. success: function (res) {
10. var sessionId = res.data;
11. that.setData({ sessionId: sessionId })
12. wx.setStorageSync('sessionId', sessionId)
13. that.decodeUserInfo()
14. }
15. })
16. },
17. decodeUserInfo: function () {
18. let that = this
19. wx.request({
20. url: 'https://localhost/decrypt.php',
21. data: {
22. encryptedData: that.data.encryptedData,
23. iv: that.data.iv,
24. session: wx.getStorageSync('sessionId')
25. },
26. method: 'GET', // OPTIONS, GET, HEAD, POST, PUT, DELETE, TRACE, CONNECT
27. // header: {}, // 设置请求的 header
28. success: function (res) {
29. let todayStep = res.data.stepInfoList.pop()
30. that.setData({
31. step: todayStep.step
32. });
33. }
34. })
35. },
36. onLoad: function () {
37. let that = this
38. wx.login({
39. success: function (res) {
40. let code = res.code
41. that.setData({ code: code })
42. wx.getWeRunData({//解密微信运动
43. success(res) {
44. const wRunEncryptedData = res.encryptedData
45. that.setData({ encryptedData: wRunEncryptedData })
46. that.setData({ iv: res.iv })
47. that.get3rdSession()//解密请求函数
48. }
49. })
50. }
51. })
52. }

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

1. $appid = '你的appid';
2. $appsecret = '你的appsecret';
3.  
4. $url = 'https://api.weixin.qq.com/sns/jscode2session?appid='.$appid.'&secret='.$appsecret.'&js_code='.$_GET['code'].'&grant_type=authorization_code';
5.  
6. $content = file_get_contents($url);
7. $content = json_decode($content);
8. echo $content->session_key;

decrypt.php部分代码

1. $pc = new WXBizDataCrypt($appid, $sessionKey);
2. $errCode = $pc->decryptData($encryptedData, $iv, $data );
3.  
4. if ($errCode == 0) {
5. print($data . "\n");
6. } else {
7. print($errCode . "\n");
8. }