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正文：
详解：
wx.requestPayment(OBJECT)
发起微信支付。
Object参数说明：
| 参数 | 类型 | 必填 | 说明 |
|---|---|---|---|
| timeStamp | String | 是 | 时间戳从1970年1月1日00:00:00至今的秒数,即当前的时间 |
| nonceStr | String | 是 | 随机字符串，长度为32个字符以下。 |
| package | String | 是 | 统一下单接口返回的 prepay_id 参数值，提交格式如：prepay_id=* |
| signType | String | 是 | 签名算法，暂支持 MD5 |
| paySign | String | 是 | 签名,具体签名方案参见小程序支付接口文档; |
| success | Function | 否 | 接口调用成功的回调函数 |
| fail | Function | 否 | 接口调用失败的回调函数 |
| complete | Function | 否 | 接口调用结束的回调函数（调用成功、失败都会执行） |
了解更多信息，请查看微信支付接口文档
回调结果：
| 回调类型 | errMsg | 说明 |
|---|---|---|
| success | requestPayment:ok | 调用支付成功 |
| fail | requestPayment:fail cancel | 用户取消支付 |
| fail | requestPayment:fail (detail message) | 调用支付失败，其中 detail message 为后台返回的详细失败原因 |
demo
//index.js//获取应用实例const app = getApp()Page({ data: { }, onLoad: function () { wx.login({ success(res) { if (res.code) { //登陆 wx.request({ url: 'http://localhost/login.php', method: 'POST', data: { code: res.code }, header: { "content-type": "application/x-www-form-urlencoded" }, success(res) { console.log(res.data) wx.request({ url: 'http://localhost/pay1.php', method: 'POST', data: { total_fee: 11, openid: res.data }, header: { "content-type": "application/x-www-form-urlencoded" }, success(res) { console.log(res.data) pbj =res.data; wx.requestPayment({ 'timeStamp': pbj.timeStamp, 'nonceStr': pbj.nonceStr.toString(), 'package': pbj.package, 'signType': 'MD5', 'paySign': pbj.paySign, 'success': function (res) { console.log("吊起支付:" + res) }, 'fail': function (res) { console.log("失败" + JSON.stringify(pbj.nonceStr)) }, 'complete': function (res) { console.log("res" + JSON.stringify(res)) }, }) } }) } }) } else { console.log('登录失败！' + res.errMsg) } } }) }})
login.php
<?php// app_id wx4bb0aadc3a08b089 session_key e7ad3c0fd99eb11fd6e4863b358d938a header("Content-Type:text/html;charset=utf8"); header("Access-Control-Allow-Origin: *"); //解决跨域header('Access-Control-Allow-Methods:POST');// 响应类型 header('Access-Control-Allow-Headers:*'); // 响应头设置 $code = $_POST['code'];$url='https://api.weixin.qq.com/sns/jscode2session?appid=222&secret=111&js_code='.$code.'&grant_type=authorization_code';$html = file_get_contents($url);echo $html;?>pay1.php
<?php header("Content-Type:text/html;charset=utf8"); header("Access-Control-Allow-Origin: *"); //解决跨域header("Access-Control-Allow-Methods:POST");// 响应类型 header("Access-Control-Allow-Headers:*"); // 响应头设置 $params = [ 'appid' => 'wx4d7fcc145ca8013b',//微信小程序appid 'mch_id' => 1555453311,//商户号id 'nonce_str' => (string) mt_rand(10000, 99999), //随机数 'body' => '会员', //商品标识 'out_trade_no' => 'jay2019_' . time(),//订单号，要唯一的 'total_fee' => 100,//金额，以分为单位 'spbill_create_ip' => '106.54.254.212',//服务器IP地址 'notify_url' => 'https://aikaoya.cloudlinks.com.cn/index.php',//能访问的地址 'trade_type' => 'JSAPI', 'openid' => $_POST['openid']// 小程序传来的OpenID];// 按照要求计算signksort($params);$sequence = '';foreach ($params as $key => $value) { $sequence .= "$key=$value&";}$sequence = $sequence . "key=shige1351shige1351shige135123456";//商户号密钥$params['sign'] = strtoupper(md5($sequence));// 给微信发出的请求，整个参数是个XML$xml = '<xml>' . PHP_EOL;foreach ($params as $key => $value) { $xml .= "<$key>$value</$key>" . PHP_EOL;}$xml .= '</xml>';$prepayId = https_curl_json('https://api.mch.weixin.qq.com/pay/unifiedorder',$xml);$response= [ 'appId' => 'wx4d7fcc145ca8013b', // 随机串，32个字符以内 'nonceStr' => (string) mt_rand(100005645, 9999956464), // 微信规定 'package' => 'prepay_id='.$prepayId, 'signType' => 'MD5', // 时间戳，注意得是字符串形式的 'timeStamp' => (string) time(),];$sequence = '';foreach ($response as $key => $value) { $sequence .= "$key=$value&";}$response['paySign'] = strtoupper(md5("{$sequence}key=shige1351shige1351shige135123456"));//商户号密钥echo urldecode(json_encode($response)); /* 发送json格式的数据，到api接口 -xzz0704 */ function https_curl_json($url,$data){ $curl = curl_init();//设置urlcurl_setopt($curl, CURLOPT_URL,$url);//设置发送方式：postcurl_setopt($curl, CURLOPT_POST, true);//试试手气新增，增加之后 curl 不报 60# 错误，可以请求到微信的响应curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false); //不验证 SSL 证书curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);//不验证 SSL 证书域名//设置发送数据curl_setopt($curl, CURLOPT_POSTFIELDS, $data);//TRUE 将curl_exec()获取的信息以字符串返回，而不是直接输出curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);$return_xml = curl_exec($curl);//关闭cURL资源，并且释放系统资源curl_close($curl);//禁止引用外部xml实体libxml_disable_entity_loader(true);//先把xml转换为simplexml对象，再把simplexml对象转换成 json，再将 json 转换成数组。$value_array = json_decode(json_encode(simplexml_load_string($return_xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);$return_xml = $value_array['prepay_id'];if ($return_xml) {return $return_xml;} else {$error = curl_errno($curl);return "curl error, error code ".$error;//throw new WxPayException("curl出错，错误码:$error");} }?>完成
统一下单参考php
<?php /* * 小程序微信支付 */ class WeixinPay { protected $appid; protected $mch_id; protected $key; protected $openid; protected $out_trade_no; protected $body; protected $total_fee; function __construct($appid, $openid, $mch_id, $key,$out_trade_no,$body,$total_fee) { $this->appid = $appid; $this->openid = $openid; $this->mch_id = $mch_id; $this->key = $key; $this->out_trade_no = $out_trade_no; $this->body = $body; $this->total_fee = $total_fee; } public function pay() { //统一下单接口 $return = $this->weixinapp(); return $return; } //统一下单接口 private function unifiedorder() { $url = 'https://api.mch.weixin.qq.com/pay/unifiedorder'; $parameters = array( 'appid' => $this->appid, //小程序ID 'mch_id' => $this->mch_id, //商户号 'nonce_str' => $this->createNoncestr(), //随机字符串// 'body' => 'test', //商品描述 'body' => $this->body,// 'out_trade_no' => '2015450806125348', //商户订单号 'out_trade_no'=> $this->out_trade_no,// 'total_fee' => floatval(0.01 * 100), //总金额 单位 分 'total_fee' => $this->total_fee,// 'spbill_create_ip' => $_SERVER['REMOTE_ADDR'], //终端IP 'spbill_create_ip' => '192.168.0.161', //终端IP 'notify_url' => 'http://www.weixin.qq.com/wxpay/pay.php', //通知地址 确保外网能正常访问 'openid' => $this->openid, //用户id 'trade_type' => 'JSAPI'//交易类型 ); //统一下单签名 $parameters['sign'] = $this->getSign($parameters); $xmlData = $this->arrayToXml($parameters); $return = $this->xmlToArray($this->postXmlCurl($xmlData, $url, 60)); return $return; } private static function postXmlCurl($xml, $url, $second = 30) { $ch = curl_init(); //设置超时 curl_setopt($ch, CURLOPT_TIMEOUT, $second); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE); curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); //严格校验 //设置header curl_setopt($ch, CURLOPT_HEADER, FALSE); //要求结果为字符串且输出到屏幕上 curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE); //post提交方式 curl_setopt($ch, CURLOPT_POST, TRUE); curl_setopt($ch, CURLOPT_POSTFIELDS, $xml); curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20); curl_setopt($ch, CURLOPT_TIMEOUT, 40); set_time_limit(0); //运行curl $data = curl_exec($ch); //返回结果 if ($data) { curl_close($ch); return $data; } else { $error = curl_errno($ch); curl_close($ch); throw new WxPayException("curl出错，错误码:$error"); } } //数组转换成xml private function arrayToXml($arr) { $xml = "<root>"; foreach ($arr as $key => $val) { if (is_array($val)) { $xml .= "<" . $key . ">" . arrayToXml($val) . "</" . $key . ">"; } else { $xml .= "<" . $key . ">" . $val . "</" . $key . ">"; } } $xml .= "</root>"; return $xml; } //xml转换成数组 private function xmlToArray($xml) { //禁止引用外部xml实体 libxml_disable_entity_loader(true); $xmlstring = simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA); $val = json_decode(json_encode($xmlstring), true); return $val; } //微信小程序接口 private function weixinapp() { //统一下单接口 $unifiedorder = $this->unifiedorder();// print_r($unifiedorder); $parameters = array( 'appId' => $this->appid, //小程序ID 'timeStamp' => '' . time() . '', //时间戳 'nonceStr' => $this->createNoncestr(), //随机串 'package' => 'prepay_id=' . $unifiedorder['prepay_id'], //数据包 'signType' => 'MD5'//签名方式 ); //签名 $parameters['paySign'] = $this->getSign($parameters); return $parameters; } //作用：产生随机字符串，不长于32位 private function createNoncestr($length = 32) { $chars = "abcdefghijklmnopqrstuvwxyz0123456789"; $str = ""; for ($i = 0; $i < $length; $i++) { $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1); } return $str; } //作用：生成签名 private function getSign($Obj) { foreach ($Obj as $k => $v) { $Parameters[$k] = $v; } //签名步骤一：按字典序排序参数 ksort($Parameters); $String = $this->formatBizQueryParaMap($Parameters, false); //签名步骤二：在string后加入KEY $String = $String . "&key=" . $this->key; //签名步骤三：MD5加密 $String = md5($String); //签名步骤四：所有字符转为大写 $result_ = strtoupper($String); return $result_; } ///作用：格式化参数，签名过程需要使用 private function formatBizQueryParaMap($paraMap, $urlencode) { $buff = ""; ksort($paraMap); foreach ($paraMap as $k => $v) { if ($urlencode) { $v = urlencode($v); } $buff .= $k . "=" . $v . "&"; } $reqPar; if (strlen($buff) > 0) { $reqPar = substr($buff, 0, strlen($buff) - 1); } return $reqPar; }}
