實際支付之前，需要先請求預充值信息，獲取訂單流水號，實際支付的時候需要帶上這個參數，等到支付成功，訂單流水號會直接返給支付結果回調通知地址。掃唄官網：http://help.lcsw.cn/xrmpic/ti...
總體流程圖如下：
- 請求預充值信息
getOrderNo() {
return new Promise((resolve, reject) => {
myAjax('getOrderNo','POST' {
payAmount: 1 // 表示充值一分錢
}, (res) => {
this.setData({
orderNo: res.orderNo // 表示返回的訂單流水號
}, () => {
resolve()
})
})
})
}- 去充值，由於別的頁面也需要購買或充值，這裏封裝成了公共方法publicPay，引入
const { publicPay } = require('../../util/public.js') async goRecharge() {
await this.getOrderNo() // 需要先等返回訂單流水號
let param = {
orderNo: this.data.orderNo,
total_fee: this.data.amountSelected.toString() // 金額，單位分
}
publicPay(param, (res, paySuccess) => {
if (paySuccess) {
// 表示支付成功
}
})
},- publicPay方法需要先引入md5，代碼如下：
const md5 = require('../libs/md5/md5')
export const publicPay = (param, cb) => {
const sub_appid = 'wx543795375437543' // 微信小程序的appid
const open_id = wx.getStorageSync('openid') // 使用微信支付時為必填項，請提前獲取
const sb_http = 'https://pay.lcsw.cn/lcsw/pay/100/minipay' // 掃唄支付接口地址
const sb_key = '5034217reywrruewi23143e75b' // 掃唄提供給商户的密鑰，一種token
// 以下是必填參數
const pay_ver = '100' // 掃唄版本號，請到掃唄官網查看當前版本號
const pay_type = '010' // 支付方式，010 代表微信
const service_id = '015' // 接口類型，請到掃唄官網查看當前接口類型
const merchant_no = '85343242342341' // 掃唄提供的商户號
const terminal_id = '13065307' // 掃唄提供的終端號
const terminal_trace = param.orderNo // 訂單流水號
const terminal_time = getDateTimeToString() // 交易時間，這裏是公共方法，下面有介紹
const total_fee = param.total_fee // 金額單位:分
// 必傳參數拼接生成 key_sign
let mustParamString = `pay_ver=${pay_ver}&pay_type=${pay_type}&service_id=${service_id}&merchant_no=${merchant_no}&terminal_id=${terminal_id}&terminal_trace=${terminal_trace}&terminal_time=${terminal_time}&total_fee=${total_fee}&access_token=${sb_key}`
let key_sign = md5.hexMD5(mustParamString) // 需要md5加密
// 以下是非必填參數
let order_body = '本次支付的訂單描述，選填'
let notify_url = 'https://xxx.xxx.com/xxx' // 支付結果回調通知地址，跟後端約好
let params = {
pay_ver,
pay_type,
service_id,
merchant_no,
terminal_id,
terminal_trace,
terminal_time,
total_fee,
sub_appid,
open_id,
key_sign,
order_body,
notify_url
}
wx.request({
url: sb_http,
method: 'POST',
data: params,
dataType: 'json',
success: function (res) {
// 把掃唄返回的結果，放進微信支付需要的參數
wx.requestPayment({
timeStamp: res.data.timeStamp,
nonceStr: res.data.nonceStr,
package: res.data.package_str,
signType: 'MD5',
paySign: res.data.paySign,
success(resPay) {
// 支付成功的回調
cb(resPay, 'paySuccess')
},
fail(resPayFail) {
cb(resPayFail)
}
})
},
fail: function (err) {
if (err) {
cb(err)
}
}
})
}- 支付所需要的交易時間格式，yyyyMMddHHmmss，方法如下：
getDateTimeToString() {
var date_ = new Date();
var year = date_.getFullYear();
var month = date_.getMonth() + 1;
var day = date_.getDate();
if (month < 10) month = "0" + month;
if (day < 10) day = "0" + day;
var hours = date_.getHours();
var mins = date_.getMinutes();
var secs = date_.getSeconds();
var msecs = date_.getMilliseconds();
if (hours < 10) hours = "0" + hours;
if (mins < 10) mins = "0" + mins;
if (secs < 10) secs = "0" + secs;
if (msecs < 10) secs = "0" + msecs;
return year + month + day + hours + mins + secs;
}- md5.js 代碼如下：
/*
* 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://pajhome.org.uk/site/legal.html for details.
*/
/*
* 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)
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))) }
module.exports = {
hexMD5: hexMD5
} 