⼩程序使⽤⽀付功能实现在线订单⽀付
以前做过PC页⾯⽀付，但是这次在⼩程序直接调⽤⽀付功能还是⽅便很多
先说说整个下单⽀付流程的整体思路，
0，准备⼯作：
⼀，appId，开发帐号中注册时的appId。
⼆，sdkContent，后台返回的包含有⾦额，⽀付⽅式等信息的数据包。
三，key值，商户申请⽀付功能时所配置的密钥
准备好后，
1，⾸先选择下单⾦额和⽀付⽅式【这⾥默认只有⽀付⼀个】，拿到⾦额和⽀付⽅式和⽤户唯⼀识别码【登陆时就放⼊缓存中】，发送到后端下单接⼝⽣成订单号
2，拿到返回的订单号和⽤户唯⼀识别码，再到后台现⾦充值接⼝拿到sdkContent，也就是⼀会在下⼀步⽀付中要⽤到的package参数，
3，将开发帐号中注册时的appId【注意：区别于后台之间通讯⽤的appId，两不同也不通⽤】，时间戳，随机串，签名⽅式和数据包按签名规则拼接成字符串，后⾯接上key 值【key值：商户申请⽀付功能时所配置的密钥】
使⽤MD5⽅式进⾏加密，再将成⽣的加密字符中的字母全部换成⼤写，然后将加密串与appId，时间戳，随机串，签名⽅式和数据包调⽤wx.requestPayment(OBJECT)发起⽀付
如果规则符合，基本就可以⽀付成功了
注意要点：appid不要弄错，sdkContent别名要换成指定的prepay_id，参数名⼤⼩写，key值放在尾部，其他参数按序排列，加密完成后字母全部⼤写
第⼀步：下单
subRecharge: function (e) { //充值下单
var that = this
var amount = Number(Price); //⾦额 [单位：分]
if (amount==''){
return;
}
var appid = getApp().globalData.appid; //appid
var timestamp = Date.parse(new Date());//获取当前时间戳
timestamp = timestamp / 1000;
var version = getApp().globalData.version; //版本号
var sign = getApp().globalData.sign; //签名
var userIdEnc = wx.getStorageSync('userIdEnc'); //获取本地缓存中的userIdEnc //⽤户唯⼀识别码
var loginDevice = wx.getStorageSync('loginDevice');//获取本地缓存中的loginDevice
var data = { "appId": appid, "timestamp": timestamp, "version": version, "userIdEnc": userIdEnc, "amount": amount };
var url = getApp().globalData.url; //接⼝路径
var key = getApp().globalData.appkey;  //加密k值
var encryption = ption(key, data) //算出签名
sign = encryption;//赋值给签名
data.sign = sign;
data = JSON.stringify(data);
// console.log('算出签名的data结果：', data)
var header = {
'content-type': 'application/json',
'cookie': "devimark=" + loginDevice + ";" + "usenc=" + userIdEnc,
};
method: "post",
url: url + '/order/recharge/createAmountOrder',
data: data + '@#@' + appid,
header: header,
dataType: "json",
success: function (res) {
// console.log("充值成功", res)
if (de == '0000') { //下单成功
that.setData({
systemOrderNo: res.data.data.systemOrderNo //返回充值订单编号
});
that.cashPay(); //调⽤⽀付⽅法
} else if (de == '2014'){  //2014 ⽤户没有登录
wx.navigateTo({
url: '../../pages/logs/logs',
})
}else{
wx.navigateTo({
url: '../../pages/rechargeFailure/rechargeFailure',//充值失败页
})
}
}, fail: function (res) {
console.log("充值失败", res)
wx.navigateTo({
url: '../../pages/rechargeFailure/rechargeFailure',//充值失败页
})
}
})
}
第⼆步：使⽤订单号获取⽀付数据包【含第三步：调⽤⽀付接⼝】
cashPay: function(){ // 现⾦充值
var that = this
/
/ var amount = Number(Price); //⾦额
var systemOrderNo = that.data.systemOrderNo;//充值订单号
var cashPayWayId = getApp().globalData.cashPayWayId; //现⾦⽀付⽅式ID
var appid = getApp().globalData.appid; //appid
var timestamp = Date.parse(new Date());//获取当前时间戳
timestamp = timestamp / 1000;
var version = getApp().globalData.version; //版本号
var sign = getApp().globalData.sign; //签名
var userIdEnc = wx.getStorageSync('userIdEnc'); //获取本地缓存中的userIdEnc //⽤户唯⼀识别码
var loginDevice = wx.getStorageSync('loginDevice');//获取本地缓存中的loginDevice
var data = { "appId": appid, "timestamp": timestamp, "version": version, "systemOrderNo": systemOrderNo, "cashPayWayId": cashPayWayId };
var url = getApp().globalData.url; //接⼝路径
var key = getApp().globalData.appkey;  //加密k值
var encryption = ption(key, data) //算出签名
sign = encryption;//赋值给签名
data.sign = sign;
data = JSON.stringify(data);
// console.log('算出签名的data结果：', data)
var header = {
'content-type': 'application/json',
'cookie': "devimark=" + loginDevice + ";" + "usenc=" + userIdEnc,
};
method: "post",
url: url + '/pay/cash/cashPay',
data: data + '@#@' + appid,
header: header,
dataType: "json",
success: function (res) {
// console.log("现⾦⽀付成功", res)
if (de == '0000') { //现⾦⽀付成功
var sdkContent = 'prepay_id='+res.data.data.sdkContent;
var wxappid = getApp().globalData.wxappid; //appid
var timestamp = Date.parse(new Date());//获取当前时间戳
timestamp = timestamp / 1000;
timestamp = String();
var nonceStr = Num(); //随机串
var signType = 'MD5';
var paykey = getApp().globalData.paykey;
var paySign = { "appId": wxappid, "nonceStr": nonceStr, "package": sdkContent, "signType": signType, "timeStamp": timestamp,}
var objKeySort = utils.objKeySort(paySign); //排序
paySign = utils.splicingString(objKeySort); //按⽀付验签规则拼接字符串
paySign = paySign + "&key=" + paykey;  //尾部添加key值【商户密钥】
console.log("sort_ASCII", objKeySort);
console.log("paySign", paySign);
var md5 = require('../../utils/js/md5.js');  //md5加密
var md5Pw = md5.hexMD5(paySign);
paySign = UpperCase(); //按⽀付验签规则将签名字母转⼤写
console.log(paySign);
console.log(timestamp, nonceStr, sdkContent, paySign);
{
'timeStamp': timestamp,
'nonceStr': nonceStr,
'package': sdkContent,
'signType': 'MD5',
'paySign': paySign,
'success': function (res) {
// console.log(1);
wx.navigateTo({
url: '../../pages/rechargeSuccess/rechargeSuccess',//充值成功页
})
},
'fail': function (res) {
wx.navigateTo({
url: '../../pages/rechargeFailure/rechargeFailure',//充值失败页
})
},
'complete': function (res) {
wx.navigateTo({
url: '../../pages/rechargeFailure/rechargeFailure',//充值失败页
})
}
})
// console.log("0000", res.data.data.systemOrderNo)
} else if (de == '2014') {  //2014 ⽤户没有登录
wx.navigateTo({
url: '../../pages/logs/logs',
})
} else {
wx.navigateTo({
url: '../../pages/rechargeFailure/rechargeFailure',//充值失败页
})
}
}, fail: function (res) {
console.log("充值失败", res)
wx.navigateTo({
url: '../../pages/rechargeFailure/rechargeFailure',//充值失败页
})
}
})
},
注意检查签名加密前的顺序和⼤⼩写
appId=wxd678efh567hg6787&nonceStr=5K8264ILTKCH16CQ2502SI8ZNMTM67VS&package=prepay_id=wx2017033010242291fcfe0db70013231072&signType=MD5&timeStamp=1490840662&ke
其中有⽤到的⼀些数据处理⽅法，封装在util.js中⽅便全局调⽤，这⾥也给贴上
//key值顺序排序的函数
function objKeySort(obj) {//排序的函数
var newkey = Object.keys(obj).sort();
//先⽤Object内置类的keys⽅法获取要排序对象的属性名，再利⽤Array原型上的sort⽅法对获取的属性名进⾏排序，newkey是⼀个数组
var newObj = {};//创建⼀个新的对象，⽤于存放排好序的键值对
for (var i = 0; i < newkey.length; i++) {//遍历newkey数组
newObj[newkey[i]] = obj[newkey[i]];//向新创建的对象中按照排好的顺序依次增加键值对
}
return newObj;//返回排好序的新对象
}
function splicingString(obj){ //封装全局拼接⽀付验签字符串
var str = '';
var arr = Object.keys(obj);
var j = arr.length;
var k = 0;
for (var i in obj) {
k++;
// console.log("aa.length::", j, k)
if (j == k) {
str += i + "=" + obj[i]
} else {
str += i + "=" + obj[i] + "&"
}
// console.log(i,'--',aa[i]);
}
return str;
/
/ console.log(str)
}
function getNum() { //随机⽣成32位随机数
var chars = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'];
var nums = "";
for (var i = 0; i < 32; i++) {
var id = parseInt(Math.random() * 61);
nums += chars[id];
}
return nums;
}
formatTime: formatTime,
// Bytes2Str: Bytes2Str,
// Str2Bytes: Str2Bytes,
encryption: encryption,
getNum: getNum,
objKeySort: objKeySort,
sort_ASCII: sort_ASCII,
splicingString: splicingString
}
MD5加密⽂件
/*      * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message      * Digest Algorithm, as defined in RFC 1321.      * Version 1.1 Copyright (C) Paul Johnston 1999 - 2002.      * Code also contributed by Greg Holt      * See http /*      * Add integers, wrapping at 2^32. This uses 16-bit operations internally      * to work around bugs in some JS interpreters.      */
function safe_add(x, y) {
var lsw = (x & 0xFFFF) + (y & 0xFFFF)
var msw = (x >> 16) + (y >> 16) + (lsw >> 16)
return (msw << 16) | (lsw & 0xFFFF)
}
/*      * Bitwise rotate a 32-bit number to the left.      */
function rol(num, cnt) {
return (num << cnt) | (num >>> (32 - cnt))
}
/*      * These functions implement the four basic operations the algorithm uses.      */
function cmn(q, a, b, x, s, t) {
return safe_add(rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b)
}
function ff(a, b, c, d, x, s, t) {
return cmn((b & c) | ((~b) & d), a, b, x, s, t)
}
function gg(a, b, c, d, x, s, t) {
return cmn((b & d) | (c & (~d)), a, b, x, s, t)
}
function hh(a, b, c, d, x, s, t) {
return cmn(b ^ c ^ d, a, b, x, s, t)
}
function ii(a, b, c, d, x, s, t) {
return cmn(c ^ (b | (~d)), a, b, x, s, t)
}
/*      * Calculate the MD5 of an array of little-endian words, producing an array      * of little-endian words.      */
function coreMD5(x) {
var a = 1732584193
var b = -271733879
var c = -1732584194
var d = 271733878
for (var i = 0; i < x.length; i += 16) {
var olda = a
var oldb = b
var oldc = c
var oldd = d
a = ff(a, b, c, d, x[i + 0], 7, -680876936)
d = ff(d, a, b, c, x[i + 1], 12, -389564586)
c = ff(c, d, a, b, x[i + 2], 17, 606105819)
b = ff(b, c, d, a, x[i + 3], 22, -1044525330)
a = ff(a, b, c, d, x[i + 4], 7, -176418897)
小程序 字符串转数组d = ff(d, a, b, c, x[i + 5], 12, 1200080426)
c = ff(c, d, a, b, x[i + 6], 17, -1473231341)
b = ff(b, c, d, a, x[i + 7], 22, -45705983)
a = ff(a, b, c, d, x[i + 8], 7, 1770035416)
d = ff(d, a, b, c, x[i + 9], 12, -1958414417)
c = ff(c, d, a, b, x[i + 10], 17, -42063)
b = ff(b, c, d, a, x[i + 11], 22, -1990404162)
a = ff(a, b, c, d, x[i + 12], 7, 1804603682)
d = ff(d, a, b, c, x[i + 13], 12, -40341101)
c = ff(c, d, a, b, x[i + 14], 17, -1502002290)
b = ff(b, c, d, a, x[i + 15], 22, 1236535329)
a = gg(a, b, c, d, x[i + 1], 5, -165796510)
d = gg(d, a, b, c, x[i + 6], 9, -1069501632)
c = gg(c, d, a, b, x[i + 11], 14, 643717713)
b = gg(b, c, d, a, x[i + 0], 20, -373897302)
a = gg(a, b, c, d, x[i + 5], 5, -701558691)
d = gg(d, a, b, c, x[i + 10], 9, 38016083)
c = gg(c, d, a, b, x[i + 15], 14, -660478335)
b = gg(b, c, d, a, x[i + 4], 20, -405537848)
a = gg(a, b, c, d, x[i + 9], 5, 568446438)
d = gg(d, a, b, c, x[i + 14], 9, -1019803690)
c = gg(c, d, a, b, x[i + 3], 14, -187363961)
b = gg(b, c, d, a, x[i + 8], 20, 1163531501)
a = gg(a, b, c, d, x[i + 13], 5, -1444681467)
d = gg(d, a, b, c, x[i + 2], 9, -51403784)
c = gg(c, d, a, b, x[i + 7], 14, 1735328473)
b = gg(b, c, d, a, x[i + 12], 20, -1926607734)
a = hh(a, b, c, d, x[i + 5], 4, -378558)
d = hh(d, a, b, c, x[i + 8], 11, -2022574463)
c = hh(c, d, a, b, x[i + 11], 16, 1839030562)
b = hh(b, c, d, a, x[i + 14], 23, -35309556)
a = hh(a, b, c, d, x[i + 1], 4, -1530992060)
d = hh(d, a, b, c, x[i + 4], 11, 1272893353)
c = hh(c, d, a, b, x[i + 7], 16, -155497632)
b = hh(b, c, d, a, x[i + 10], 23, -1094730640)
a = hh(a, b, c, d, x[i + 13], 4, 681279174)
d = hh(d, a, b, c, x[i + 0], 11, -358537222)
c = hh(c, d, a, b, x[i + 3], 16, -722521979)
b = hh(b, c, d, a, x[i + 6], 23, 76029189)
a = hh(a, b, c, d, x[i + 9], 4, -640364487)
d = hh(d, a, b, c, x[i + 12], 11, -421815835)
c = hh(c, d, a, b, x[i + 15], 16, 530742520)
b = hh(b, c, d, a, x[i + 2], 23, -995338651)
a = ii(a, b, c, d, x[i + 0], 6, -198630844)
d = ii(d, a, b, c, x[i + 7], 10, 1126891415)
c = ii(c, d, a, b, x[i + 14], 15, -1416354905)
b = ii(b, c, d, a, x[i + 5], 21, -57434055)
a = ii(a, b, c, d, x[i + 12], 6, 1700485571)
d = ii(d, a, b, c, x[i + 3], 10, -1894986606)
c = ii(c, d, a, b, x[i + 10], 15, -1051523)
b = ii(b, c, d, a, x[i + 1], 21, -2054922799)
a = ii(a, b, c, d, x[i + 8], 6, 1873313359)
d = ii(d, a, b, c, x[i + 15], 10, -30611744)
c = ii(c, d, a, b, x[i + 6], 15, -1560198380)
b = ii(b, c, d, a, x[i + 13], 21, 1309151649)
a = ii(a, b, c, d, x[i + 4], 6, -145523070)
d = ii(d, a, b, c, x[i + 11], 10, -1120210379)
c = ii(c, d, a, b, x[i + 2], 15, 718787259)
b = ii(b, c, d, a, x[i + 9], 21, -343485551)
a = safe_add(a, olda)
b = safe_add(b, oldb)
c = safe_add(c, oldc)
d = safe_add(d, oldd)
}
return [a, b, c, d]
}
/*      * Convert an array of little-endian words to a hex string.      */
function binl2hex(binarray) {
var hex_tab = "0123456789abcdef"
var str = ""
for (var i = 0; i < binarray.length * 4; i++) {
str += hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8 + 4)) & 0xF) + hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8)) & 0xF)
}
return str
}
/*      * Convert an array of little-endian words to a base64 encoded string.      */
function binl2b64(binarray) {
var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
var str = ""
for (var i = 0; i < binarray.length * 32; i += 6) {
str += tab.charAt(((binarray[i >> 5] << (i % 32)) & 0x3F) | ((binarray[i >> 5 + 1] >> (32 - i % 32)) & 0x3F))
}
return str
}
/*      * Convert an 8-bit character string to a sequence of 16-word blocks, stored      * as an array, and append appropriate padding for MD4/5 calculation.      * If any of the characters are >255, the high byte is silently ignored.      */ function str2binl(str) {
var nblk = ((str.length + 8) >> 6) + 1 // number of 16-word blocks
var blks = new Array(nblk * 16)
for (var i = 0; i < nblk * 16; i++) blks[i] = 0
for (var i = 0; i < str.length; i++)
blks[i >> 2] |= (str.charCodeAt(i) & 0xFF) << ((i % 4) * 8)
blks[i >> 2] |= 0x80 << ((i % 4) * 8)
blks[nblk * 16 - 2] = str.length * 8
return blks
}
/*      * Convert a wide-character string to a sequence of 16-word blocks, stored as      * an array, and append appropriate padding for MD4/5 calculation.      */
function strw2binl(str) {
var nblk = ((str.length + 4) >> 5) + 1 // number of 16-word blocks
var blks = new Array(nblk * 16)
for (var i = 0; i < nblk * 16; i++) blks[i] = 0
for (var i = 0; i < str.length; i++)
blks[i >> 1] |= str.charCodeAt(i) << ((i % 2) * 16)
blks[i >> 1] |= 0x80 << ((i % 2) * 16)
blks[nblk * 16 - 2] = str.length * 16
return blks
}
/*      * External interface      */
function hexMD5(str) { return binl2hex(coreMD5(str2binl(str))) }
function hexMD5w(str) { return binl2hex(coreMD5(strw2binl(str))) }
function b64MD5(str) { return binl2b64(coreMD5(str2binl(str))) }
function b64MD5w(str) { return binl2b64(coreMD5(strw2binl(str))) }
/* Backward compatibility */
function calcMD5(str) { return binl2hex(coreMD5(str2binl(str))) }
View Code
最后，成功调取⽀付功能！

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