先看一下小程序开发步骤
步骤
-
wx.login调用接口获取登录凭证(code)
-
code 换取用户的唯一标识(openid)-
https://api.weixin.qq.com/sns/jscode2session?appid=APPID&secret=SECRET&js_code=JSCODE&grant_type=authorization_code
-
-
统一下单
- URL地址:https://api.mch.weixin.qq.com/pay/unifiedorder
- post
- 参数为XML
-
wx.requestPayment进行支付
- 签名MD5加密,网上有些算法是错误的,自己写完还需要在线MD5加密工具进行校验(我采坑一下午,怎么看我写的怎么对,就是出不来,原因就是MD5工具使用错误,坑爹- - )
-
签名规则注意事项(must)
- ◆ 参数名ASCII码从小到大排序(字典序);
- ◆ 如果参数的值为空不参与签名;
- ◆ 参数名区分大小写;
- ◆ 验证调用返回或微信主动通知签名时,传送的sign参数不参与签名,将生成的签名与该sign值作校验。
- ◆ 微信接口可能增加字段,验证签名时必须支持增加的扩展字段
- 统一下单签名appid,wx.requestPayment签名appId(大小写必须区分,真是找瞎我钛合金狗眼- - )
-
wx.requestPayment中package参数必须是package:"prepay_id=wx21**************",不然,会出现调用支付JSAPI缺少appid/total_fee
- total_fee为分,并且是int
- 生成随机数和时间戳一定要保证签名与上传参数一致
- 大小写。。一定要注意
- 微信小程序trade_type=JSAPI,openid参数必传
-
wx.requestPayment生成签名有appId,请求的时候没有appId
好了,上代码了(代码很原始,没有封装)
- /* 微信支付 */
- wxpay: function () {
- var that = this
- //登陆获取code
- wx.login({
- success: function (res) {
- console.log(res.code)
- //获取openid
- that.getOpenId(res.code)
- }
- });
- },
- /* 获取openId */
- getOpenId: function (code) {
- var that = this
- wx.request({
- url: "https://api.weixin.qq.com/sns/jscode2session?appid=wxbd5a8270399d41d9&secret=d8aac26a5a9c16266d1a23851ebb7d9b&js_code=" + code + "&grant_type=authorization_code",
- method: 'GET',
- success: function (res) {
- //统一支付签名
- var appid = '';//appid
- var body = '';//商户名
- var mch_id = '';//商户号
- var nonce_str = that.randomString;//随机字符串,不长于32位。
- var notify_url = '';//通知地址
- var spbill_create_ip = '';//ip
- // var total_fee = parseInt(that.data.wxPayMoney) * 100;
- var total_fee = 100;
- var trade_type = "JSAPI";
- var key = '';
- var unifiedPayment = 'appid=' + appid + '&body=' + body + '&mch_id=' + mch_id + '&nonce_str=' + nonce_str + '¬ify_url=' + notify_url + '&openid=' + res.data.openid + '&out_trade_no=' + that.data.paySn + '&spbill_create_ip=' + spbill_create_ip + '&total_fee=' + total_fee + '&trade_type=' + trade_type + '&key=' + key
- var sign = MD5.MD5(unifiedPayment).toUpperCase()
- console.log(sign)
- //封装统一支付xml参数
- var formData = "<xml>"
- formData += "<appid>" + appid + "</appid>"
- 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>" + res.data.openid + "</openid>"
- formData += "<out_trade_no>" + that.data.paySn + "</out_trade_no>"
- formData += "<spbill_create_ip>" + spbill_create_ip + "</spbill_create_ip>"
- formData += "<total_fee>" + total_fee + "</total_fee>"
- formData += "<trade_type>" + trade_type + "</trade_type>"
- formData += "<sign>" + sign + "</sign>"
- formData += "</xml>"
- //统一支付
- wx.request({
- url: 'https://api.mch.weixin.qq.com/pay/unifiedorder',
- method: 'POST',
- head: 'application/x-www-form-urlencoded',
- data: formData, // 设置请求的 header
- success: function (res) {
- console.log(res.data)
- var result_code = that.getXMLNodeValue('result_code', res.data.toString("utf-8"))
- var resultCode = result_code.split('[')[2].split(']')[0]
- if (resultCode == 'FAIL') {
- var err_code_des = that.getXMLNodeValue('err_code_des', res.data.toString("utf-8"))
- var errDes = err_code_des.split('[')[2].split(']')[0]
- wx.navigateBack({
- delta: 1, // 回退前 delta(默认为1) 页面
- success: function (res) {
- wx.showToast({
- title: errDes,
- icon: 'success',
- duration: 2000
- })
- },
- })
- } else {
- //发起支付
- var prepay_id = that.getXMLNodeValue('prepay_id', res.data.toString("utf-8"))
- var tmp = prepay_id.split('[')
- var tmp1 = tmp[2].split(']')
- //签名
- var key = '';
- var appId = '';
- var timeStamp = that.createTimeStamp();
- var nonceStr = that.randomString();
- var stringSignTemp = "appId=&nonceStr=" + nonceStr + "&package=prepay_id=" + tmp1[0] + "&signType=MD5&timeStamp=" + timeStamp + "&key="
- var sign = MD5.MD5(stringSignTemp).toUpperCase()
- console.log(sign)
- var param = { "timeStamp": timeStamp, "package": 'prepay_id=' + tmp1[0], "paySign": sign, "signType": "MD5", "nonceStr": nonceStr }
- that.pay(param)
- }
- },
- })
- },
- fail: function () {
- // fail
- },
- complete: function () {
- // complete
- }
- })
- },
- /* 随机数 */
- randomString: function () {
- var chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678'; /****默认去掉了容易混淆的字符oOLl,9gq,Vv,Uu,I1****/
- var maxPos = chars.length;
- var pwd = '';
- for (var i = 0; i < 32; i++) {
- pwd += chars.charAt(Math.floor(Math.random() * maxPos));
- }
- return pwd;
- },
- /* 获取prepay_id */
- getXMLNodeValue: function (node_name, xml) {
- var tmp = xml.split("<" + node_name + ">")
- var _tmp = tmp[1].split("</" + node_name + ">")
- return _tmp[0]
- },
- /* 时间戳产生函数 */
- createTimeStamp: function () {
- return parseInt(new Date().getTime() / 1000) + ''
- },
- /* 支付 */
- pay: function (param) {
- wx.requestPayment({
- timeStamp: param.timeStamp,
- nonceStr: param.nonceStr,
- package: param.package,
- signType: param.signType,
- paySign: param.paySign,
- success: function (res) {
- // success
- console.log(res)
- wx.navigateBack({
- delta: 1, // 回退前 delta(默认为1) 页面
- success: function (res) {
- wx.showToast({
- title: '支付成功',
- icon: 'success',
- duration: 2000
- })
- },
- fail: function () {
- // fail
- },
- complete: function () {
- // complete
- }
- })
- },
- fail: function () {
- // fail
- console.log("支付失败")
- },
- complete: function () {
- // complete
- console.log("pay complete")
- }
- })
- }