1.先写一个可以点击支付的按钮
<view class="chongzhi_button" bindtap="pay">支付</view>
2.开始js代码
pay: function(){ //下订单并唤起微信支付 var price = '0.01'; //支付金额 var openid = ''; //这里传用户openid,怎么获取用户的openid这里就不详细的说了 var that = this; wx.request({ url: '这里写后端接口地址', data: { price: price, openid: openid }, method: "POST", headers: { 'Content-Type': 'application/json' }, success: function (res) { //客户单发起微信请求 wx.requestPayment({ 'appId': '这里写小程序的appId', 'timeStamp': res.data.timeStamp, 'nonceStr': res.data.nonceStr, 'package': res.data.package, 'signType': 'MD5', 'paySign': res.data.paySign, 'success': function (res) { wx.showToast({ title: '支付成功', duration: 1200 }) console.log('支付成功'); setTimeout(function () { wx.redirectTo({ url: '../pay/payok?paymoney=' + that.data.paymoney + '&body=' + that.data.contents }) }, 1000); //这里完成跳转 }, 'fail': function (res) { if (res.errMsg == "requestPayment:fail cancel") { wx.showToast({ title: '支付取消', duration: 1200 }) } else { wx.showToast({ title: '支付失败', image: '../../images/error.png', duration: 1200 }) } //支付失败 console.log(res); }, 'complete': function (res) { } }) } })
二、然后开始后端代码（这里用PHP代码作为示例，没办法，只会PHP）
代码开始
/** * 小程序支付 */ public function Pay(){ $fee = 0.01;//举例充值0.01 $openid = '填写openid'; $appid = '小程序AddId';//这里写小程序AddId $body = '标题'; //这个自己写,微信订单里面显示的是商品名称 $mch_id = '你的商户号'; $nonce_str = $this->nonce_str();//随机字符串 $notify_url = '填写你的回调地址'; $out_trade_no = $this->order_number($openid);//商户订单号 $spbill_create_ip = '服务器Ip地址'; $total_fee = $fee*100;//因为充值金额最小是1 而且单位为分 如果是充值1元所以这里需要*100 $trade_type = 'JSAPI';//交易类型 默认 //这里是按照顺序的 因为下面的签名是按照顺序 排序错误 肯定出错 $post['appid'] = $appid; $post['body'] = $body; $post['mch_id'] = $mch_id; $post['nonce_str'] = $nonce_str; //随机字符串 $post['notify_url'] = $notify_url; $post['openid'] = $openid; $post['out_trade_no'] = $out_trade_no; $post['spbill_create_ip'] = $spbill_create_ip; //终端的ip $post['total_fee'] = $total_fee; //总金额 最低为一块钱 必须是整数 $post['trade_type'] = $trade_type; $sign = $this->sign($post); //签名 $post_xml = '<xml> <appid>'.$appid.'</appid> <body>'.$body.'</body> <mch_id>'.$mch_id.'</mch_id> <nonce_str>'.$nonce_str.'</nonce_str> <notify_url>'.$notify_url.'</notify_url> <openid>'.$openid.'</openid> <out_trade_no>'.$out_trade_no.'</out_trade_no> <spbill_create_ip>'.$spbill_create_ip.'</spbill_create_ip> <total_fee>'.$total_fee.'</total_fee> <trade_type>'.$trade_type.'</trade_type> <sign>'.$sign.'</sign> </xml> '; //统一接口prepay_id $url = 'https://api.mch.weixin.qq***/pay/unifiedorder'; $xml = $this->http_request($url,$post_xml); $array = $this->xml($xml);//全要大写 if($array['RETURN_CODE'] == 'SUCCESS' && $array['RESULT_CODE'] == 'SUCCESS'){ $time = time(); $tmp='';//临时数组用于签名 $tmp['appId'] = $appid; $tmp['nonceStr'] = $nonce_str; $tmp['package'] = 'prepay_id='.$array['PREPAY_ID']; $tmp['signType'] = 'MD5'; $tmp['timeStamp'] = "$time"; $data['state'] = 1; $data['timeStamp'] = "$time";//时间戳 $data['nonceStr'] = $nonce_str;//随机字符串 $data['signType'] = 'MD5';//签名算法，暂支持 MD5 $data['package'] = 'prepay_id='.$array['PREPAY_ID'];//统一接口返回的 prepay_id 参数值，提交格式如：prepay_id=* $data['paySign'] = $this->sign($tmp);//签名,具体签名方案参见微信公众号支付帮助文档; $data['out_trade_no'] = $out_trade_no; }else{ $data['state'] = 0; $data['text'] = "错误"; $data['RETURN_CODE'] = $array['RETURN_CODE']; $data['RETURN_MSG'] = $array['RETURN_MSG']; } echo json_encode($data); } //随机32位字符串 private function nonce_str(){ $result = ''; $str = 'QWERTYUIOPASDFGHJKLZXVBNMqwertyuioplkjhgfdsamnbvcxz'; for ($i=0;$i<32;$i++){ $result .= $str[rand(0,48)]; } return $result; } //生成订单号 private function order_number($openid){ //date('Ymd',time()).time().rand(10,99);//18位 return md5($openid.time().rand(10,99));//32位 } //签名 $data要先排好顺序 private function sign($data){ $stringA = ''; foreach ($data as $key=>$value){ if(!$value) continue; if($stringA) $stringA .= '&'.$key."=".$value; else $stringA = $key."=".$value; } $wx_key = '支付秘钥'; $stringSignTemp = $stringA.'&key='.$wx_key;//申请支付后有给予一个商户账号和密码，登陆后自己设置key return strtoupper(md5($stringSignTemp)); } //curl请求啊 function http_request($url,$data = null,$headers=array()){ $curl = curl_init(); if(count($headers)>= 1){ curl_setopt($curl, CURLOPT_HTTPHEADER, $headers); } curl_setopt($curl, CURLOPT_URL, $url); curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE); curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE); if(!empty($data)){ curl_setopt($curl, CURLOPT_POST, 1); curl_setopt($curl, CURLOPT_POSTFIELDS, $data); } curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1); $output = curl_exec($curl); curl_close($curl); return $output; } //获取xml private function xml($xml){ $p = xml_parser_create(); xml_parse_into_struct($p, $xml, $vals, $index); xml_parser_free($p); $data = ""; foreach ($index as $key=>$value){ if($key == 'xml' || $key == 'XML') continue; $tag = $vals[$value[0]]['tag']; $value = $vals[$value[0]]['value']; $data[$tag] = $value; } return $data; }
原文链接：https://www.php.cn/blog/detail/14510.html 经验来自于网络，侵权删