这个代码全是干货呀，拿过来可以直接使用。小程序在调起微信支付之前需要5个参数，这时候就需要携带code向后台请求，然后后台根据code获取openid 再进行服务器之间的。。。。
一、准备工作
1、小程序注册，要以公司的以身份去注册一个小程序，才有微信支付权限；
2、绑定商户号。
3、在小程序填写合法域
二、完成以上条件，你可以得到
小程序appid 小程序秘钥 这两个用于获取用户openid；
商户号id ,商户号秘钥 支付接口必须的；
三、开始开发
前台代码
/*调起微信支付 @param 支付价格，不填写默认为1分钱*/function pay(total_fee) {var total_fee = total_fee; wx.login({success: res => {//code 用于获取openID的条件之一var code = res.code;wx.request({url: '后台地址/index.php',method: "POST",data: {total_fee:total_fee,code: code,},header: {'content-type': 'application/x-www-form-urlencoded' // 默认值},success: function (res) { //后端返回的数据var data = res.data;console.log(data);console.log(data["timeStamp"]);wx.requestPayment({timeStamp: data['timeStamp'],nonceStr: data['nonceStr'],package: data['package'],signType: data['signType'],paySign: data['paySign'],success: function (res) {wx.showModal({title: '支付成功',content: '',})},fail: function (res) {console.log(res);}})}});}})}
以下是PHP后台代码 ，这里用的是tp框架
<?phpnamespace Home\Controller;use Think\Controller;class PayController extends Controller {//微信支付public function pay(){//获取openidif(I("post.code")){ //用code获取openid$code=I("post.code");$WX_APPID = '';//appid$WX_SECRET = '';//AppSecret$url = "https://api./sns/jscode2session?appid=" . $WX_APPID . "&secret=" . $WX_SECRET . "&js_code=" . $code . "&grant_type=authorization_code";$infos = json_decode(file_get_contents($url));$openid = $infos->openid;}//$fee = I("post.total_fee");$fee = 0.01;//举例支付0.01$appid = '';//appid.如果是公众号 就是公众号的appid$body = '标题';$mch_id = ''; //商户号$nonce_str = $this->nonce_str();//随机字符串$notify_url = ''; //回调的url【自己填写】$openid = $openid;$out_trade_no = $this->order_number();//商户订单号$spbill_create_ip = '';//服务器的ip【自己填写】;$total_fee = $fee*100;// 微信支付单位是分，所以这里需要*100$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'] = $total_fee;//总金额$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> ';//print_r($post_xml);die;//统一接口prepay_id$url = 'https://api.mch./pay/unifiedorder';$xml = $this->http_request($url,$post_xml);$array = $this->xml($xml);//全要大写//print_r($array);if($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";$data['state'] = 200;$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'];//统一下单接口返回的 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;}$wx_key = '';//申请支付后有给予一个商户账号和密码，登陆后自己设置的key$stringSignTemp = $stringA.'&key='.$wx_key;return strtoupper(md5($stringSignTemp));}//curl请求public function http_request($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 $output;}//获取xmlprivate function xml($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;}}
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