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微信硬件H5開發(fā)之控制燈光

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Mar 16, 2018 pm 02:27 PM

html5 控制燈光

這次給大家?guī)砦⑿庞布﨟5開發(fā)之控制燈光，微信硬件H5開發(fā)控制燈光的注意事項有哪些，下面就是實戰(zhàn)案例，一起來看一下。

你可以自己扒，帶參數(shù)的頁面在瀏覽器中打開會馬上跳轉(zhuǎn)，不帶參數(shù)的會提示參數(shù)不全，需要用mobile模式觀看。

呈現(xiàn)的界面如下：

目錄結(jié)構(gòu)?

解壓開lamp.js ，目錄如下，這個demo是基于sea.js+zepto實現(xiàn)，sea.js用來加載模塊，zepto提供ajax請求和tab事件等。

common中包含了一個keyConfig.js(地址參數(shù))，一個reqData.js(請求封裝)還有一個zepto，ui里是一個上面圖片的中的slider一樣的組件。util中是一組方法集合。最重要的就是lamp.js 。

define(function?(require)?{????var?$?=?require("common/zepto");????var?keyConfig?=?require("common/keyConfig");????var?reqData?=?require("common/reqData");????var?util?=?require("util/util");????var?ProcessBar?=?require("ui/process-bar");????var?pageParam?=?{
????????device_id:?util.getQuery("device_id"),
????????device_type:?util.getQuery("device_type"),
????????appid:?util.getQuery("appid")
????};????var?lastModTime?=?0;????var?powerBtn?=?$("#powerBtn"),?//?開關(guān)按鈕????????lightBar;????var?device_status=?{
????????services:?{
????????????lightbulb:?{alpha:0},
????????????operation_status:{status:0}
????????}
????};?//?數(shù)據(jù)對象
????(function?()?{????????if(!pageParam.device_id?||?!pageParam.device_type){
????????????alert("頁面缺少參數(shù)");????????????return;
????????}
????????log("appid:"?+?pageParam.appid);
????????log("device_id:"?+?pageParam.device_id);
????????log("device_type:"?+?pageParam.device_type);
????????powerBtn.on("tap",?togglePower);?//?開關(guān)按鈕事件????????initBar();
????????initInterval();????????//?todo?:?for?test,?delete?before?submit//????????renderPage({});????})();????/**
?????*?初始化進度條?????*/
????function?initBar()?{
????????log("初始化lightBar");
????????lightBar?=?new?ProcessBar({
????????????$id:?"lightBar",
????????????min:?0,
????????????stepCount:?100,
????????????step:?1,
????????????touchEnd:?function?(val)?{
????????????????device_status.services.lightbulb.alpha?=?val;
????????????????log("亮度值為："+val);????????????????setData();
????????????}
????????});
????}????/**
?????*?請求數(shù)據(jù)?????*/
????function?getData()?{
????????reqData.ajaxReq({????????????//url:?keyConfig.GET_LAMP_STATUS,
????????????url:'https://api.weixin.qq.com/device/getlampstatus',
????????????data:?pageParam,
????????????onSuccess:?renderPage,
????????????onError:function(msg)?{
????????????????log("獲取數(shù)據(jù)失敗:"?+?JSON.stringify(msg));
????????????}
????????});
????}????/**
?????*?設(shè)置數(shù)據(jù)?????*/
????function?setData()?{
????????console.log("setUrl",?keyConfig.SET_LAMP_STATUS);
????????lastModTime?=?new?Date().getTime();?//?更新最后一次操作時間????????reqData.ajaxReq({???????????//?url:?keyConfig.SET_LAMP_STATUS,
????????????url:?'https://api.weixin.qq.com/device/setlampstatus',
????????????type:?"POST",
????????????data:?JSON.stringify(device_status)
????????});
????????log("setData:"?+?JSON.stringify(device_status));
????}????/**
?????*?開關(guān)按鈕事件?????*/
????function?togglePower()?{
????????$("#switchBtn").toggleClass("on").toggleClass("off");
????????log("燈的狀態(tài)status:"+device_status.services.operation_status.status);????????if(device_status.services.operation_status.status==0){
????????????device_status.services.operation_status.status?=?1;
????????????log("燈的狀態(tài):1");
????????}?else?{
????????????device_status.services.operation_status.status?=?0;
????????????log("燈的狀態(tài):0");
????????}????????setData();
????}????/**
?????*?輪詢?????*/
????function?initInterval()?{
????????getData();
????????setInterval(function?()?{????????????if((new?Date().getTime()?-?lastModTime)?>?2000){?//?當有設(shè)置操作時，停止1s輪詢，2秒后繼續(xù)輪詢????????????????getData();
????????????}
????????},?1000);
????}????/**
?????*?渲染頁面?????*/
????function?renderPage(json)?{????????//?todo?:?for?test,?delete?before?submit//????????json?=?{//????????????device_status:?{//????????????????services:?{//????????????????????operation_status:?{//????????????????????????status:?0//????????????????????},//????????????????????lightbulb:?{//????????????????????????alpha:?0//????????????????????}//????????????????}//????????????}//????????};
????????log("renderPage:"+json);????????if(!json.device_status){????????????return;
????????}
????????console.log("json",?json);
????????device_status?=?json.device_status;
????????log(device_status);????????if(device_status.services.operation_status.status==0){
????????????$("#switchBtn").addClass("on").removeClass("off");
????????}?else?{
????????????$("#switchBtn").addClass("off").removeClass("on");
????????}
????????lightBar.setVal(device_status.services.lightbulb.alpha);
????}
});/*??|xGv00|4199711a9ade00e2807e7ea576d92f55?*/

?首先我們看到pageParam對象是獲取頁面上參數(shù)的，device_id，device_type以及appid三個參數(shù)。其實有用的只有前面兩個，因為appid的話，后臺服務(wù)器已經(jīng)配置了，而且在微信中的通過“進入面板”的時候只附帶了id和type兩個參數(shù)。然后device_status是一個設(shè)備狀態(tài)對象對象是燈，根據(jù)微信services的定義，燈有一個亮度值。這個在上一篇提到過。然后是一個立即執(zhí)行的匿名函數(shù)，這個函數(shù)函數(shù)里面會先檢查一下參數(shù)，然后初始化開關(guān)和亮度條。最好進入循環(huán)。initInterval中就是不斷的通過getdata獲取數(shù)據(jù)。注意到這兒有一個lastModTime的比較，然后延時2秒再觸發(fā)，這個地方主要是因為每次設(shè)置之后再從服務(wù)器撈到數(shù)據(jù)有一個延時。原本是10，你設(shè)置了20，bar也到了20的位置，但是呢，服務(wù)器還有一個10在路上發(fā)過來，你設(shè)置的20并沒有馬上失效，這會有一個卡頓的效果。但這個兩秒也不是那么的有效，卡頓還是會有；另外一方面就是，不能設(shè)置太快，設(shè)置太快了會報50019的錯誤(設(shè)備正在被操作)；getdata成功后，就是renderpage，這個不用解釋了。注意到在綁定開關(guān)時間的地方，其實是先調(diào)用了一次setdata

?powerBtn.on("tap",?togglePower);?function?togglePower()?{
????????$("#switchBtn").toggleClass("on").toggleClass("off");
????????log("燈的狀態(tài)status:"+device_status.services.operation_status.status);????????if(device_status.services.operation_status.status==0){
????????????device_status.services.operation_status.status?=?1;
????????????log("燈的狀態(tài):1");
????????}?else?{
????????????device_status.services.operation_status.status?=?0;
????????????log("燈的狀態(tài):0");
????????}????????setData();
????}

?這個作用有兩個，一個是獲取設(shè)備目前的狀態(tài)，因為設(shè)備可能沒有開啟，或者沒有聯(lián)網(wǎng)，二個是將參數(shù)傳遞給后臺，不然getdata無效。最后理清一下思路就是

獲取參數(shù)-->初始化-->setdata一次-->循環(huán)-->渲染頁面 ?界面操作-->setdata-->延時讀取。加上后端的部分，全部的流程圖如下。

所以拿到前端代碼只是一半，后端還需要自己實現(xiàn)。

實現(xiàn)

純靜態(tài)文件是無法請求微信服務(wù)器的，所以我們需要自己實現(xiàn)后臺的部分，這也是第一節(jié)中要講的目的。

html：

@{
????Layout?=?null;
}<!DOCTYPE html><html><head>
????<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
????<meta id="viewport" name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
????<title>我的燈泡</title>
????<link href="/css/common.css" rel="stylesheet" />
????<link href="/css/light_switch.css" rel="stylesheet" /></head><body>
????<p>
????????<p class="body">
????????????<p class="inner">
????????????????<p id="switchBtn" class="status_button off">
????????????????????<p class="button_wrp">
????????????????????????<p class="button_mask">
????????????????????????????<p class="alerter_button" id="powerBtn">
????????????????????????????????<i class="status_pot"></i>
????????????????????????????????<span class="on">ON</span>
????????????????????????????????<span class="off">OFF</span>
????????????????????????????</p>
????????????????????????</p>
????????????????????</p>
????????????????????<p class="on">
????????????????????????<h2>燈已開</h2>
????????????????????</p>
????????????????</p>
????????????????<p id="reData"></p>
????????????</p>
????????</p>
????????<p class="foot">
????????????<p class="slider_box J_slider_box">
????????????????<i class="slider_box_icon icon dark"></i>
????????????????<p id="lightBar" class="slider_box_bar">
????????????????????<p class="slider_box_slider J_slider" style="left:0%">
????????????????????????<p class="slider_box_slider_label J_value"></p>
????????????????????????<i class="slider_box_slider_touch"></i>
????????????????????</p>
????????????????????<p class="slider_box_line">
????????????????????????<span class="slider_box_line_fill J_fill" style="width:0%"></span>
????????????????????</p>
????????????????</p>
????????????????<i class="slider_box_icon icon light"></i>
????????????</p>
????????</p>
????</p>
????<script src="/js/sea.js"></script>
????<script>
????????seajs.config({
????????????base:?'/js/',????????????//map:?[[/^(.*\.(?:css|js))(.*)$/i,?"$1"]],????????????charset:?'utf-8'
????????});
????????seajs.use("baby");????</script></body></html>

View Code

自己的實現(xiàn)就拿掉了遮罩和config部分，將sea.js的目錄改到自己對應(yīng)的目錄即可：

???seajs.config({
????????????base:?'/js/',????????????//map:?[[/^(.*\.(?:css|js))(.*)$/i,?"$1"]],
????????????charset:?'utf-8'
????????});
????????seajs.use("baby");

這個baby(命名和產(chǎn)品有關(guān)~)就相當于是lamp。另外就是，修改請求地址。也就是通過后臺調(diào)用api來實現(xiàn)getdate和setdata。第一版我修改的js和lamp.js的差別不大就增加了一個log為了調(diào)試，修改調(diào)用路徑。

define(function?(require)?{????var?$?=?require("common/zepto");????var?util?=?require("util/util");????var?ProcessBar?=?require("ui/process-bar");??
????var?requestData?=?{
????????services:?{
????????????lightbulb:?{?alpha:?10?},
????????????air_conditioner:?{},
????????????power_switch:?{},
????????????operation_status:?{?status:?0?}
????????},
????????device_type:?util.getQuery("device_type"),
????????device_id:?util.getQuery("device_id"),
????????user:?'',
????};????var?lastModTime?=?0;????var?powerBtn?=?$("#powerBtn"),?//?開關(guān)按鈕???????lightBar;????function?log(msg,?arg)?{
????????console.log(msg,?arg);
????????msg?=?JSON.stringify(msg);????????if?(arg)?{
????????????msg?=?msg?+?","?+?JSON.stringify(arg);
????????}
????????$.post('/device/log',?{?msg:?msg?});
????}
????(function?()?{
????????bindEvent();????????if?(!requestData.device_id?||?!requestData.device_type)?{
????????????alert("頁面缺少參數(shù)");????????????return;
????????}
????????powerBtn.on("tap",?togglePower);?//?開關(guān)按鈕事件????????initBar();
????????queryDevice();
????})();????function?bindEvent()?{
????????$(".footer?.nav_side?li").click(function?()?{
????????????activePage($(this).data("index"),?$(this));
????????});
????}????function?activePage(index,?$self)?{
????????$self.parent('li').addClass("on");
????????$body.find('.page:eq('?+?index?+?')').addClass("active").siblings().removeClass("active");
????}????/**
?????*?初始化進度條?????*/
????function?initBar()?{
????????log("初始化lightBar");
????????lightBar?=?new?ProcessBar({
????????????$id:?"lightBar",
????????????min:?0,
????????????stepCount:?100,
????????????step:?1,
????????????touchEnd:?function?(val)?{
????????????????requestData.services.lightbulb.alpha?=?val;
????????????????log("亮度值為："?+?val);
????????????????setData();
????????????}
????????});
????}????/**
???*?開關(guān)按鈕事件???*/
????function?togglePower()?{
????????$("#switchBtn").toggleClass("on").toggleClass("off");????????if?(requestData.services.operation_status.status?==?0)?{
????????????requestData.services.operation_status.status?=?1;
????????????log("燈的狀態(tài):1");
????????}?else?{
????????????requestData.services.operation_status.status?=?0;
????????????log("燈的狀態(tài):0");
????????}
????????setData();
????}????function?queryDevice()?{
????????$.getJSON('/device/RequestDeviceStatus',?{?reqstr:?JSON.stringify(requestData)?},????????????function?(data)?{
????????????????console.log(data);????????????????if?(data.error_code?==?0)?{????????????????????//請求成功;????????????????????initInterval();
????????????????????console.log("查詢成功");
????????????????}?else?{
????????????????????alert(data.error_msg);
????????????????}
????????????});
????}????/**
???*?輪詢???*/
????function?initInterval()?{
????????getData();
????????setInterval(function?()?{????????????if?((new?Date().getTime()?-?lastModTime)?>?2000)?{?//?當有設(shè)置操作時，停止1s輪詢，2秒后繼續(xù)輪詢????????????????getData();
????????????}
????????},?1000);
????}????function?setData()?{
????????$.getJSON('/device/RequestDeviceStatus',?{?reqstr:?JSON.stringify(requestData)?},?function?(data)?{
????????????console.log(data);
????????????lastModTime?=?new?Date().getTime();????????????if?(data.error_code?==?0)?{
????????????????console.log("設(shè)置成功");
????????????}
????????});
????}????function?getData()?{
????????$.post('/device/getData',?function?(data)?{
????????????$("#reData").html(JSON.stringify(data));????????????if?(data?&&?data.services)?{
????????????????renderPage(data);
????????????}
????????});
????};????function?renderPage(json)?{????????if?(!json.services)?{????????????return;
????????}
????????console.log("json",?json);
????????requestData?=?json;????????if?(requestData.services.operation_status.status?==?0)?{
????????????$("#switchBtn").addClass("off").removeClass("on");
????????}?else?{
????????????$("#switchBtn").addClass("on").removeClass("off");
????????}
????????lightBar.setVal(requestData.services.lightbulb.alpha);
????}
})

View Code

?我將pageParam和device_status做成了一個對象。requestData。

????var?requestData?=?{
????????services:?{
????????????lightbulb:?{?alpha:?10?},???????????//?air_conditioner:?{},????????????power_switch:?{},
????????????operation_status:?{?status:?0?}
????????},
????????device_type:?util.getQuery("device_type"),
????????device_id:?util.getQuery("device_id"),
????????user:?'',
????};

后臺就是兩個主要方法，一個設(shè)置(查詢頁就是設(shè)置)，一個讀取。這里又回到上一節(jié)的內(nèi)容了。我先查詢一次設(shè)備(lamp中在綁定)之后，再進入循環(huán)。

setdata

public?ActionResult?RequestDeviceStatus(string?reqstr)
????????{????????????if?(string.IsNullOrEmpty(reqstr))
????????????{????????????????return?Json("-1",?JsonRequestBehavior.AllowGet);
????????????}????????????var?args?=?JsonConvert.DeserializeObject<RequestData>(reqstr);
????????????args.user?=?getOpenId(args.device_type,?args.device_id);
????????????Session["warmwood"]?=?args.device_id;????????????//args.services.air_conditioner?=?null;
????????????args.services.power_switch?=?null;
????????????args.services.lightbulb.value_range?=?null;????????????try
????????????{????????????????var?res?=?wxDeviceService.RequestDeviceStatus(getToken(),?args);????????????????if?(res.error_code?!=?0)
????????????????{
????????????????????Logger.Debug("error_code:"?+?res.error_code);
????????????????????Logger.Debug("error_msg:"?+?res.error_msg);
????????????????}????????????????return?Json(res,?JsonRequestBehavior.AllowGet);
????????????}????????????catch?(ErrorJsonResultException?e)
????????????{????????????????if?(e.JsonResult.errcode.ToString()?==?"access_token?expired")
????????????????{????????????????????//重新獲取token????????????????}
????????????????Logger.Debug("請求失?。?quot;?+?e.Message);
????????????}????????????return?Json("-1",?JsonRequestBehavior.AllowGet);
????????}

這個方法先將字符串轉(zhuǎn)成我們的RequestData對象，RequestData如下：

????public?class?RequestData
????{????????public?string?device_type?{?get;?set;?}????????public?string?device_id?{?get;?set;?}????????public?string?user?{?get;?set;?}????????public?Service?services?{?get;?set;?}????????public?object?data?{?get;?set;?}
????}

services就是根據(jù)微信services定義的，可以參考上一節(jié)，然后用wxDeviceService請求。

?var?res?=?wxDeviceService.RequestDeviceStatus(getToken(),?args);????????????????if?(res.error_code?!=?0)
????????????????{
????????????????????Logger.Debug("error_code:"?+?res.error_code);
????????????????????Logger.Debug("error_msg:"?+?res.error_msg);
????????????????}???return?Json(res,?JsonRequestBehavior.AllowGet);

設(shè)置之后馬上會受到是否設(shè)置成功的響應(yīng)，error_code 可能為50019(設(shè)置頻繁),50013(網(wǎng)絡(luò)問題)等等。真正的設(shè)備狀態(tài)是通過getdata獲得的。

getdata

????????public?JsonResult?GetData()
????????{????????????var?userdata?=?getUserWxData();????????????return?Json(userdata.ResponseData,?JsonRequestBehavior.AllowGet);
????????}

getdata比較簡單就是返回數(shù)據(jù)，但是這個數(shù)據(jù)是在ReceiveWXMsg方法中設(shè)置的。這個上一節(jié)也講過，這是在公眾號后臺我們設(shè)置的一個地址。

???public?string?ReceiveWXMsg()
????????{
????????????//somecode
????????????try
????????????{????????????????var?userdata?=?getUserWxData();????????????????var?data?=?wxDeviceService.GetDeviceStatus(Request);
????????????????userdata.ResponseData?=?data;
????????????????Logger.Debug("ResponseData.asy_error_code:"?+?userdata.ResponseData.asy_error_code);
????????????????Logger.Debug("ResponseData.asy_error_msg:"?+?userdata.ResponseData.asy_error_msg);
????????????????setUserWxData(userdata);
????????????}????????????catch?(Exception?e)
????????????{
????????????????Logger.Debug(e.Message);
????????????}????????????return?echostr;
????????}

wxDeviceService如下：

using?System;using?System.Collections.Generic;using?System.Diagnostics;using?System.IO;using?System.Linq;using?System.Net.Http;using?System.Web;using?Newtonsoft.Json;using?Niqiu.Core.Domain.Common;using?Senparc.Weixin;using?Senparc.Weixin.Exceptions;using?SendHelp=?Senparc.Weixin.CommonAPIs.CommonJsonSend;namespace?Portal.MVC.WXDevice
{????public?class?WxDeviceService:IWxDeviceService
????{????????//private?readonly?ICacheManager?_cacheManager;????????//public?WxDeviceService(ICacheManager?cacheManager)????????//{????????//????_cacheManager?=?cacheManager;????????//}
????????public?TokenResult?GetAccessToken()
????????{????????????var?url?=?string.Format(WxDeviceConfig.AccessTokenUrl,?WxDeviceConfig.AppId,?WxDeviceConfig.APPSECRET);????????????var?res?=?SendHelp.Send<TokenResult>(null,?url,?null,?CommonJsonSendType.GET);????????????return?res;
????????}????????public?WxResponseData?GetDeviceStatus(HttpRequestBase?request)
????????{
????????????Stream?postData?=?request.InputStream;
????????????StreamReader?sRead?=?new?StreamReader(postData);????????????string?postContent?=?sRead.ReadToEnd();????????????if?(!string.IsNullOrEmpty(postContent))
????????????{
????????????????Logger.Debug("收到數(shù)據(jù):"?+?postContent);
????????????}????????????try
????????????{????????????????var?data?=?JsonConvert.DeserializeObject<WxResponseData>(postContent);
????????????????data.rawStr?=?postContent;
????????????????Logger.Debug("轉(zhuǎn)換消息狀態(tài):"?+?data.asy_error_msg);????????????????return?data;
????????????}????????????catch?(Exception?e)
????????????{
????????????????Logger.Debug(e.Message);????????????????throw;
????????????}
????????}????????public?OpenApiResult?RequestDeviceStatus(string?accessToken,?RequestData?data)
????????{????????????var?url?=?string.Format(WxDeviceConfig.GetDeviceStatusUrl,?accessToken);????????????return?SendHelp.Send<OpenApiResult>(accessToken,?url,?data);
????????}????????public?OpenApiResult?SetDevice(string?accessToken,?RequestData?data)
????????{????????????var?url?=?string.Format(WxDeviceConfig.GetDeviceStatusUrl,?accessToken);????????????return?SendHelp.Send<OpenApiResult>(accessToken,?url,?data);
????????}????????public?string?GetOpenId(string?accessToken,string?deviceType,string?deviceId)
????????{????????????try
????????????{????????????????var?url?=?string.Format(WxDeviceConfig.GetOpenid,?accessToken,?deviceType,?deviceId);????????????????var?res?=?SendHelp.Send<OpenIdResult>(accessToken,?url,?null,?CommonJsonSendType.GET);????????????????return?res.GetOpenId();
????????????}????????????catch?(ErrorJsonResultException?e)
????????????{
????????????????Logger.Debug(e.Message);????????????????throw;
????????????}
????????}
????}
}

View Code

這方法讀到數(shù)據(jù)后就交給了userdata 緩存起來。在getdata方法中返回。

???private?UserWxData?getUserWxData()
????????{????????????var?target?=?_cacheManager.Get<UserWxData>(userKey)????new?UserWxData();????????????return?target;
????????}????????private?string?userKey
????????{????????????get
????????????{????????????????var?key?=?Session["warmwood"]????Session.SessionID;
????????????????Session.Timeout?=?240;????????????????return?key.ToString();
????????????}
????????}

View Code

UserWxData是我自定義的對象，包含了下面的幾個熟悉。

????public?class?UserWxData
????{????????private?WxResponseData?_responseData;????????public?UserWxData()
????????{
????????????CreateTime?=?DateTime.Now;
????????}????????public?DateTime?CreateTime?{?get;?set;?}????????public?TokenResult?AccessToken?{?get;?set;?}????????public?WxResponseData?ResponseData
????????{????????????get?{?return?_responseData??(_responseData=new?WxResponseData());?}????????????set?{?_responseData?=?value;?}
????????}????????public?string?OpenId?{?get;?set;?}
????}

比較重要的是token和responseData。WxResponseData 也就是最終要發(fā)給頁面上的對象。包含你需要的功能的參數(shù)。

?public?class?WxResponseData
????{????????public?int?asy_error_code?{?get;?set;?}????????public?string?asy_error_msg?{?get;?set;?}????????public?string?create_time?{?get;?set;?}????????public?string?msg_id?{?get;?set;?}????????///?<summary>
????????///?notify?說明是設(shè)備變更????????///?set_resp?說明是設(shè)置設(shè)備????????///?get_resp?說明獲取設(shè)備信息????????///?</summary>
????????public?string?msg_type?{?get;?set;?}????????public?string?device_type?{?get;?set;?}????????public?string?device_id?{?get;?set;?}????????public?object?data?{?get;?set;?}????????public?Service?services?{?get;?set;?}????????public?string?user?{?get;?set;?}????????public?string?rawStr?{?get;?set;?}
????}

severices看自己的設(shè)備定義，比如我現(xiàn)在包含了空調(diào)，開關(guān)，溫度濕度。

????public?class?Service
????{????????public?lightbulb?lightbulb?{?get;?set;?}????????public?air_conditioner?air_conditioner?{?get;?set;?}????????public?power_switch?power_switch?{?get;?set;?}????????public?operation_status?operation_status?{?get;?set;?}????????public?tempe_humidity?tempe_humidity?{?get;?set;?}
????}

到這兒，整個過程就講完了，獲取token和openid上一節(jié)講過，就不贅述了。如果后端是node的話，就不需要這么多的類型轉(zhuǎn)換了。

最后可以看下效果：