微信支付--JSAPI(NODE.JS)

其实参照官方文档一步一步操作不是很难,但很多人在签名这个地方就总是出现问题,因为文档中签名时使用的字段大小写时错误的。。。。好坑啊!!然而PHP版本的代码官方有封装SDK包,不用操心那么多细节。

NODEJS版本的只能自己写了。

1.签名方法(简单不会错)

//签名;
//mchkey是你在支付平台设置的一个API密钥
function MSign(param, mchkey){
	var string = raw(param);
	string = string + '&key=' + mchkey;	//key拼接在字符串最后面
	var crypto = require('crypto');
	return crypto.createHash('md5').update(string, 'utf8').digest('hex').toUpperCase();
}
//args是一个JSON,方法将json中的字段按照ASCII码从小到大排序,生成一个字符串key1=value1&key2=value2。 
function raw(args) {
	var keys = Object.keys(args);
	keys = keys.sort();
	var newArgs = {}; 
	keys.forEach(function (key) {
		newArgs[key] = args[key];
	});
	var string = '';
	for (var k in newArgs) {
		string += '&' + k + '=' + newArgs[k];
	}
	string = string.substr(1); 
	return string;
}

2.创建订单

	//创建随机数;
    getRandomNumberSection(begin, end) {
        return Math.floor(Math.random() * (begin - end) + end);
    }
    //创建随机字符串;
    getRandomStr(length) {
        let value = ['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', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'];
        let result = "";
        for (let i = 0; i < length; i++) {
            let v = value[getRandomNumberSection(0, value.length - 1)];
            while (i === 0 && v === '0') {
                v = value[getRandomNumberSection(0, value.length - 1)];
            }
            result += v;
        }
        return result;
    }
	//创建JSAPI订单;
	//openid:微信用户的OPENID
	//body: 订单信息;
	//out_trade_no: 你自己生产的商户订单号;
	//spbill_create_ip: 客户端IP地址
	//total_fee: 支付金额(单位分)
	async CreateJSAPIpay(openid, body, out_trade_no, spbill_create_ip, total_fee, callback) {
		let that = this;
		let notify_url = '你需要设置支付完成后的回调URL';
		let WxAppid = '微信APPID';
		let mch_id = '商户ID';
		let trade_type = 'JSAPI';
		let sign_type = 'MD5';
		let noncestr = (new Date()).getTime() + '_';
		noncestr += getRandomStr(31 - noncestr.length);	//产生32位随机字符串;
		//1.签名参数;
		let sign = MSign({
			appid: WxAppid,
			mch_id: mch_id,
			nonce_str: noncestr,
			notify_url: notify_url,
			trade_type: trade_type,
			sign_type: sign_type,
			openid: openid,		//微信用户的OPENID
			body: body,			//订单信息;
			out_trade_no: out_trade_no,//你自己生产的商户订单号;
			spbill_create_ip: spbill_create_ip,//客户端IP地址
			total_fee: total_fee	//金额(单位分)
		}, this.mchkey);

		//2.生成XML格式;
		let formData = "";
		formData += "" + WxAppid + "";
		formData += " + body + "]]>";
		formData += "" + mch_id + "";
		formData += "" + noncestr + "";
		formData += "" + notify_url + "";
		formData += "" + out_trade_no + "";
		formData += "" + spbill_create_ip + "";
		formData += "" + total_fee + "";
		formData += "" + trade_type + "";
		formData += "" + openid + "";
		formData += "" + sign_type + "";
		formData += "" + sign + ""; 	//sign是上一步签名产生的;
		formData += "";

		//3.请求微信
		let url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
		request({ url: url, method: 'POST', body: formData },
			function (err, response, body) {
				if (!err && response.statusCode == 200) {
					xmlreader.read(body.toString("utf-8"), function (errors, response) {
						if (null !== errors) {
							callback(false, errors, null);
						}
						else {
							if (response.xml.return_msg.text().toLocaleUpperCase() == 'OK') {
								//此时返回的数据并不能直接用在客户端,需要再次签名;
								let prepay_id = response.xml.prepay_id.text();
								let timestamp = parseInt(new Date().getTime() / 1000) + '';
								//4.签名
								let finalsign = MSign({
									appId: WxAppid,
									timeStamp: timestamp,
									nonceStr: noncestr,
									package: 'prepay_id=' + prepay_id,
									signType: sign_type
								}, mchkey);
								//这才是客户端最后使用的数据;
								let clientParam = {
									'appId': WxAppid,
									'nonceStr': noncestr,
									'timeStamp': timestamp,
									'package': 'prepay_id=' + prepay_id,
									'signType': that.sign_type,
									'sign': finalsign
								};
								callback(true, clientParam);
							}
							else {
								callback(false, null);
							}
						}
					});
				}
				else {
					callback(false, null);
				}
			});
	}

3.公众号网页唤起支付页面

如果要在WEB端使用微信的功能,则需要在页面打开时使用JSAPI签名进行初始化,服务端JSAPI签名的方法如下,其中,jsapi参数是使用全局access_token获取的,url是网页的地址。


	//获取JSAPI签名;
	static GetJSAPISign(appid, jsapi, url) {
		var ret = {
			jsapi_ticket: jsapi,
			noncestr: Math.random().toString(36).substr(2, 15),
			timestamp: parseInt(new Date().getTime() / 1000) + '',
			url: url
		};
		
		var string = raw(ret);

		let jsSHA = require('jssha');
		let shaObj = new jsSHA(string, 'TEXT');
		let signature = shaObj.getHash('SHA-1', 'HEX');
		return {
			appid:appid,
			nonceStr:ret.noncestr,
			timestamp:ret.timestamp,
			signature:signature,
			url: url
		};
	}

网页端初始化微信JSAPI代码
需要引入


<script>
	//我使用的EJS,参数在请求页面时就生成好了;
	var jsapiSign = JSON.parse('<%- JSON.stringify(jsapiSign)%>');
	var paymentSign = JSON.parse('<%- JSON.stringify(paymentSign)%>');
	//初始化JSAPI;
	function init(){
		wx.config({
			debug: true,
			appId: jsapiSign.appid,
			timestamp: jsapiSign.timestamp,
			nonceStr: jsapiSign.nonceStr,
			signature: jsapiSign.signature,
			jsApiList : [
				'chooseWXPay'	//请求微信支付权限
			]
		});
		
		wx.ready(function () { 
			wx.hideOptionMenu(); 	//隐藏菜单;
			onBridgeReady();	//初始化完成后立即调用微信支付;
		});
		
		wx.error(function(res){
			console.log('初始化失败了,请稍后重试');
		});
	}
	//唤起支付;
    function onBridgeReady(){
		var param = {
			appid:paymentSign.appId,
			timestamp: paymentSign.timeStamp,
			nonceStr: paymentSign.nonceStr,
			package: paymentSign.package,
			signType: paymentSign.signType,
			paySign: paymentSign.sign,
			success: function (res) {
				console.log("支付完成,请稍候");
			},
			cancel: function(res){
				console.log("用户取消支付");
			},
			fail: function(msg){
				console.log("支付调用失败");
			}
		};
		//API唤起支付;
		wx.chooseWXPay(param);
	}
	init();
</script>

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