然后在GetOpenid.ashx中加入代码如下：

1. public class GetOpenid : IHttpHandler
2. {
3. public string openid { get; set; }
4.  
5. public void ProcessRequest(HttpContext context)
6. {
7.  
8. string code = HttpContext.Current.Request.QueryString["code"];
9. WxPayData data = new WxPayData();
10. data.SetValue("appid", WxPayConfig.APPID);
11. data.SetValue("secret", WxPayConfig.APPSECRET);
12. data.SetValue("code", code);
13. data.SetValue("grant_type", "authorization_code");
14. string url = "https://api.weixin.qq.com/sns/oauth2/access_token?" + data.ToUrl();
15.  
16. //请求url以获取数据
17. string result = HttpService.Get(url);
18.  
19. Log.Debug(this.GetType().ToString(), "GetOpenidAndAccessTokenFromCode response : " + result);
20.  
21. //保存access_token，用于收货地址获取
22. JsonData jd = JsonMapper.ToObject(result);
23. //access_token = (string)jd["access_token"];
24.  
25. //获取用户openid
26. openid = (string)jd["openid"];
27. context.Response.Write(openid);//获取H5调起JS API参数
28.  
29. }

在pay.ashx中加入代码如下：

1. public class pay : IHttpHandler
2. {
3.  
4. public void ProcessRequest(HttpContext context)
5. {
6. context.Response.ContentType = "text/plain";
7.  
8. string openid = HttpContext.Current.Request.QueryString["openid"];
9. string total_fee =