本文的代码已过时，请勿照抄。建议改用云支付。 本文的代码被论坛自动过滤了所有XML的标签，所以照抄是会出错的。需要代码的话，看以前的老版本： https://developers.weixin.qq.com/community/develop/doc/000620ec5acb482103b7bf41d51804?jumpto=comment&commentid=000ea67d7b4da8d6c47acd1e05b8 代码前提：只需要替换两个与自己相关的参数key和mch_id 1、小程序开通微信支付成功，去公众平台(https://mp.weixin.qq.com/)； 成功后可以知道自己的mch_id，即商户号。 2、去这里：商户平台(https://pay.weixin.qq.com/)，获取key = API密钥，如果是退款的话，还需要下载API证书。 [图片] 以下代码仅包含统一下单，以及小程序端拉起支付的代码。 小程序端： testWxCloudPay: function () { wx.cloud.callFunction({ name: 'getPay', // data: {body:"body",attach:"attach",total_fee:1}, // 可传入相关参数。 success: res => { console.log(res.result) if (!res.result.appId) return wx.requestPayment({ ...res.result, success: res => { console.log(res) } }) } }) }, 云函数getPay： const key = "ABC...XYZ" //换成你的商户key，32位 const mch_id = "1413092000" //换成你的商户号 //以下全部照抄即可 const cloud = require('wx-server-sdk') const rp = require('request-promise') const crypto = require('crypto') cloud.init() function getSign(args) { let sa = [] for (let k in args) sa.push(k + '=' + args[k]) sa.push('key=' + key) return crypto.createHash('md5').update(sa.join('&'), 'utf8').digest('hex').toUpperCase() } function getXml(args) { let sa = [] for (let k in args) sa.push('<' + k + '>' + args[k] + '') sa.push('' + getSign(args) + '') return '' + sa.join('') + '' } exports.main = async(event, context) => { const wxContext = cloud.getWXContext() const appId = appid = wxContext.APPID const openid = wxContext.OPENID const attach = 'attach' const body = 'body' const total_fee = 1 const notify_url = "https://mysite.com/notify" const spbill_create_ip = "118.89.40.200" const nonceStr = nonce_str = Math.random().toString(36).substr(2, 15) const timeStamp = parseInt(Date.now() / 1000) + '' const out_trade_no = "otn" + nonce_str + timeStamp const trade_type = "JSAPI" const xmlArgs = { appid, openid, attach, body, mch_id, nonce_str, notify_url, out_trade_no, spbill_create_ip, total_fee, trade_type } let xml = (await rp({ url: "https://api.mch.weixin.qq.com/pay/unifiedorder", method: 'POST', body: getXml(xmlArgs) })).toString("utf-8") if (xml.indexOf('prepay_id') < 0) return xml let prepay_id = xml.split("")[0] let payArgs = { appId, nonceStr, package: ('prepay_id=' + prepay_id), signType: 'MD5', timeStamp } return { ...payArgs, paySign: getSign(payArgs) } } packge.json: { "name": "getPay", "version": "1.0.0", "description": "", "main": "index.js", "scripts": { "test": "echo \"Error: no test specified\" && exit 1" }, "author": "zfe", "license": "ISC", "dependencies": { "wx-server-sdk": "latest", "crypto": "^1.0.1", "request-promise": "^4.2.2" } } 附：完整代码片段：如果你觉得在这上面花的时间超过一天了，就去下载代码片段吧。 [图片]

真机测试已通过。你照抄就行，保证可通过。 最新完美版本可供参考： https://developers.weixin.qq.com/community/develop/article/doc/0004c4a50a03107eaa79f03cc56c13 小程序端： wx.cloud.callFunction({     name: 'getPay' ,     data: {         total_fee: parseFloat(0.01).toFixed(2) * 100,         attach: 'anything',         body: 'whatever'     } }) .then( res => {     wx.requestPayment({         appId: res.result.appid,         timeStamp: res.result.timeStamp,         nonceStr: res.result.nonce_str,         package: 'prepay_id=' + res.result.prepay_id,         signType: 'MD5',         paySign: res.result.paySign,         success: res => {             console.log(res)         }     }) }) 云函数：getPay getPay目录下共两个文件： 1､index.js 2､package.json index.js代码如下： const key = "YOURKEY1234YOURKEY1234YOURKEY123"//这是商户的key，不是小程序的密钥，32位。 const mch_id = "1413090000" //你的商户号 //将以上的两个参数换成你的，然后以下可以不用改一个字照抄 const rp = require('request-promise') const crypto = require('crypto') function paysign({ ...args }) {     let sa = []     for (let k in args) sa.push( k + '=' + args[k])     sa.push( 'key=' + key)     return crypto.createHash('md5').update(sa.join('&'), 'utf8').digest('hex').toUpperCase() } exports.main = async (event, context) => {     const appid = event.userInfo.appId     const openid = event.userInfo.openId     const attach = event.attach     const body = event.body     const total_fee = event.total_fee     const notify_url = "https://whatever.com/notify"     const spbill_create_ip = "118.89.40.200"     const nonce_str = Math.random().toString(36).substr(2, 15)     const timeStamp = parseInt(Date.now() / 1000) + ''     const out_trade_no = "otn" + nonce_str + timeStamp          let formData = "<xml>"     formData += "<appid>" + appid + "</appid>"     formData += "<attach>" + attach + "</attach>"     formData += "<body>" + body + "</body>"     formData += "<mch_id>" + mch_id + "</mch_id>"     formData += "<nonce_str>" + nonce_str + "</nonce_str>"     formData += "<notify_url>" + notify_url + "</notify_url>"     formData += "<openid>" + openid + "</openid>"     formData += "<out_trade_no>" + out_trade_no + "</out_trade_no>"     formData += "<spbill_create_ip>" + spbill_create_ip + "</spbill_create_ip>"     formData += "<total_fee>" + total_fee + "</total_fee>"     formData += "<trade_type>JSAPI</trade_type>"     formData += "<sign>" + paysign({ appid, attach, body, mch_id, nonce_str, notify_url, openid, out_trade_no, spbill_create_ip, total_fee, trade_type: 'JSAPI' }) + "</sign>"     formData += "</xml>"          let res = await rp({ url: "https://api.mch.weixin.qq.com/pay/unifiedorder", method: 'POST',body: formData})     let xml = res.toString("utf-8")     if (xml.indexOf('prepay_id')<0) return xml     let prepay_id = xml.split("<prepay_id>")[1].split("</prepay_id>")[0].split('[')[2].split(']')[0]     let paySign = paysign({ appId: appid, nonceStr: nonce_str, package: ('prepay_id=' + prepay_id), signType: 'MD5', timeStamp: timeStamp })     return { appid, nonce_str, timeStamp, prepay_id, paySign }  } package.json 代码如下： {     "name": "getPay",     "version": "1.0.0",     "description": "",     "main": "index.js",     "scripts": {     "test": "echo \"Error: no test specified\" && exit 1"     },     "author": "youself",     "license": "ISC",     "dependencies": {         "crypto": "^1.0.1",         "request-promise": "^4.2.2"     } } 最后选择：上传和部署：云端安装依赖。

为你的小程序增加computed和watch功能吧。类似的用法和实现都与vue比较相似，大家可以看看例子是怎么用的。欢迎提bug