微信小程序——微信支付，前端實現統一下單方法

微信小程序中微信支付統一下單前端實現方法：（實際項目中建議在後臺來實現）

/*統一支付接口*/
  unitedPayRequest: function () {
    var that = this;
    //統一支付簽名
    var appid = 'xxx';//appid必填
    var body = '12345';//商品名必填,沒有編碼不能用中文
    var mch_id = 'xxx';//商戶號必填
    var openid = 'xxx';
    var nonce_str = that.randomString();//隨機字符串，不長於32位。  
    var notify_url = 'xxx';//通知地址必填
    var total_fee = parseInt(0.01 * 100); //價格，這是一分錢
    var trade_type = "JSAPI";
    var key = 'xxx'; //商戶key必填，在商戶後臺獲得
    var out_trade_no = that.randomString1();//自定義訂單號必填

    var unifiedPayment = 'appid=' + appid + '&body=' + body + '&mch_id=' + mch_id + '&nonce_str=' + nonce_str + '&notify_url=' + notify_url + '&openid=' + openid + '&out_trade_no=' + out_trade_no + '&total_fee=' + total_fee + '&trade_type=' + trade_type + '&key=' + key;
    console.log("unifiedPayment", unifiedPayment);
    var sign = md5.md5(unifiedPayment).toUpperCase();
    console.log("簽名md5", sign);

    //封裝統一支付xml參數
    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>" + openid + "</openid>";
    formData += "<out_trade_no>" + out_trade_no + "</out_trade_no>";
    formData += "<total_fee>" + total_fee + "</total_fee>";
    formData += "<trade_type>" + trade_type + "</trade_type>";
    formData += "<sign>" + sign + "</sign>";
    formData += "</xml>";
    console.log("formData", formData);
    //統一支付
    wx.request({
      url: 'https://api.mch.weixin.qq.com/pay/unifiedorder', //別忘了把api.mch.weixin.qq.com域名加入小程序request白名單，這個目前可以加
      method: 'POST',
      head: 'application/json',
      data: formData, //設置請求的 header
      success: function (res) {
        console.log("返回商戶", 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.showToast({
            title: errDes,
            icon: 'none',
            duration: 3000
          })
        } else {
          //發起支付
          var prepay_id = that.getXMLNodeValue('prepay_id', res.data.toString("utf-8"));
          var tmp = prepay_id.split('[');
          var tmp1 = tmp[2].split(']');
          //簽名  
          var key = 'xxx';//商戶key必填，在商戶後臺獲得
          var appId = 'xxx';//appid必填
          var timeStamp = that.createTimeStamp();
          var nonceStr = that.randomString();
          var stringSignTemp = "appId=" + appId + "&nonceStr=" + nonceStr + "&package=prepay_id=" + tmp1[0] + "&signType=MD5&timeStamp=" + timeStamp + "&key=" + key;
          console.log("簽名字符串", stringSignTemp);
          var sign = md5.md5(stringSignTemp).toUpperCase();
          console.log("簽名", sign);
          var param = { "timeStamp": timeStamp, "package": 'prepay_id=' + tmp1[0], "paySign": sign, "signType": "MD5", "nonceStr": nonceStr }
          console.log("param小程序支付接口參數", param);
          that.processPay(param);
        }

      },
    })

  },

/* 小程序支付 */
  processPay: 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("wx.requestPayment返回信息", res);
        wx.showModal({
          title: '支付成功',
          content: '您將在“微信支付”官方號中收到支付憑證',
          showCancel: false,
          success: function (res) {
            if (res.confirm) {
            } else if (res.cancel) {
            }
          }
        })
      },
      fail: function () {
        console.log("支付失敗");
      },
      complete: function () {
        console.log("支付完成(成功或失敗都爲完成)");
      }
    })
  },

/* 時間戳產生函數   */
  createTimeStamp:function () {
    return parseInt(new Date().getTime() / 1000) + ''
  },
  /* 隨機數 */
  randomString:function () {
    var chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678'; //默認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;
  },
  //訂單號
  randomString1: function () {
    var chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678'; //默認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 < 30; i++) {
      pwd += chars.charAt(Math.floor(Math.random() * maxPos));
    }
    return pwd;
  },
  /* 獲取XML節點信息 */
  getXMLNodeValue:function (node_name, xml) {
    console.log(xml)
    var tmp = xml.split("<" + node_name + ">")
    var _tmp = tmp[1].split("</" + node_name + ">")
    return _tmp[0]
  },

*****md5.js

/* 
 * 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 = {
  md5: hexMD5
}

微信小程序——微信支付，前端實現統一下單方法

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