实际应用项目：http://github.crmeb.net/u/long
一、前端代码:
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）
代码开始
php">/**
* 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;
}
