后端接口

	namespace app\api\controller;
	
	use think\facade\Db;
	use think\facade\Env;
	use think\facade\Request; // 引入app下的Request.php文件
	use think\facade\Log;
	use EasyWeChat\Factory;
	
	class Api
	{
    
		/**
	     * 微信统一下单接口
	     */
		public function unifiedorder(){
    
		    $rvData=array("success"=>false,"data"=>[],"message"=>"","code"=>200);
	        $total_fee=input('post.total_fee');
	        $openid=input('post.openid');
	        if(isset($total_fee)&&isset($openid)){
    
	            $notify_url = "";
	            $payData["appid"]="";// APPID
	            $payData["mch_id"]=""; // 商户号
	            $payData["nonce_str"]=time();
	            $payData["body"]=""; // 备注
	            $payData["out_trade_no"]=create_guid();
	            $payData["total_fee"]=$total_fee;
	            $payData["spbill_create_ip"]=request()->ip();
	            $payData["notify_url"]= $notify_url;
	            $payData["trade_type"]="JSAPI";
	            $payData["openid"]=$openid;
	            $payData["sign_type"]="MD5";
	            $payData["sign"]=$this->setSign($payData, "商户号秘钥");
	            $this->ArrToXml($payData);
	            $xml = Request::curl("https://api.mch.weixin.qq.com/pay/unifiedorder",$str,true,true);
	            $data = $this->XmlToArr($xml);
	            if($data['return_code']=="SUCCESS"){
    
	                $jsapidata['appId'] = ""; // APPID
	                $jsapidata['timeStamp'] = (string)time();
	                $jsapidata['nonceStr'] = "str".time();
	                $jsapidata['package'] = 'prepay_id='.$data['prepay_id'];
	                $jsapidata['signType'] = 'MD5';
	                $jsapidata['paySign'] = $this->setSign($jsapidata, "商户号秘钥");
	                $payData["adddate"] = date("Y-m-d H:i:s");
	                $jsapidata["wxdata"] = $payData;
	                $rvData["success"] = true;
	                $rvData["data"] = $jsapidata;
	            }else{
    
	                $rvData["code"]=201;
	                $rvData["message"]=$data['return_msg'];
	            }
	        }else{
    
	            $rvData["code"]=201;
	            $rvData["message"]="参数错误";
	        }
	        return json($rvData);
	    }
	    
	    // 生成签名
		function setSign($payData,$key){
    
	        if(isset($payData['sign'])) {
    
	            unset($payData['sign']);
	        }
	        ksort($payData);
	        $tmp = http_build_query($payData)."&key=".$key;
	        $mtp = urldecode($tmp);
	        $tmp = strtoupper(md5($tmp));
	        return $tmp;
	    }
		//数组转xml
	    function ArrToXml($arr)
	    {
    
	        if(!is_array($arr) || count($arr) == 0) return '';
	        $xml = "<xml>";
	        foreach ($arr as $key=>$val)
	        {
    
	            if (is_numeric($val)){
    
	                $xml.="<".$key.">".$val."</".$key.">";
	            }else{
    
	                $xml.="<".$key."><![CDATA[".$val."]]></".$key.">";
	            }
	        }
	        $xml.="</xml>";
	        return $xml;
	    }
	    
	    //Xml转数组
	    function XmlToArr($xml)
	    {
    
	        if($xml == '') return '';
	        libxml_disable_entity_loader(true);
	        $arr = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
	        return $arr;
	    }
    }

Request.php文件

<?php
namespace app;

// 应用请求对象类
class Request extends \think\Request
{
    
	/**
     * @param $url 请求网址
     * @param bool $params 请求参数
     * @param int $ispost 请求方式
     * @param int $https https协议
     * @return bool|mixed
     */
    public static function curl($url, $params = false, $ispost = 0, $https = 0, $arr_header = [])
    {
    
        $httpInfo = array();
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
        curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.118 Safari/537.36');
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
        curl_setopt($ch, CURLOPT_TIMEOUT, 30);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        if(!empty($arr_header)){
    
            $arr_header[] = "Content-Length: ".strlen($params);
            curl_setopt($ch, CURLOPT_HTTPHEADER, $arr_header);
        }
        if ($https) {
    
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE); // 对认证证书来源的检查
            curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); // 从证书中检查SSL加密算法是否存在
        }
        if ($ispost) {
    
            curl_setopt($ch, CURLOPT_POST, true);
            curl_setopt($ch, CURLOPT_POSTFIELDS, $params);
            curl_setopt($ch, CURLOPT_URL, $url);
        } else {
    
            if ($params) {
    
                if (is_array($params)) {
    
                    $params = http_build_query($params);
                }
                curl_setopt($ch, CURLOPT_URL, $url . '?' . $params);
            } else {
    
                curl_setopt($ch, CURLOPT_URL, $url);
            }
        }
 
        $response = curl_exec($ch);
 
        if ($response === FALSE) {
    
            //echo "cURL Error: " . curl_error($ch);
            return false;
        }
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        $httpInfo = array_merge($httpInfo, curl_getinfo($ch));
        curl_close($ch);
        return $response;
    }
}

前端代码 uniapp部分

微信小程序支付

let data = {
    };
data.body = "描述";
data.total_fee = '支付金额' * 100;
data.openid = openid;
data.notify_url = '支付回调地址';
axios.post('请求接口为unifiedorder',data).then(res => {
    
	let _this = this;
	uni.requestPayment({
    
		provider: 'wxpay',
		timeStamp: res.data.timeStamp,
		nonceStr: res.data.nonceStr,
		package: res.data.package,
		signType: 'MD5',
		paySign: res.data.paySign,
		success: function(res2) {
    
			if (res2.errMsg == "requestPayment:ok") {
    
				console.log('付款成功！', res1);
				uni.showToast({
    
					title: "付款成功！",
					duration: 1000
				})
			}
		},
		fail: function(err) {
    
			console.log('fail:' + JSON.stringify(err));
		}
	})

	this.close();
});

微信公众号嵌入h5页面支付

npm install jweixin-module --save

import jweixin from 'jweixin-module';

// 微信统一下单接口
let data = {
    };
data.body = "描述";
data.total_fee = '支付金额' * 100;
data.openid = 'openid'
data.out_trade_no = '订单号'
data.notify_url = '支付回调';
// 调用后端统一下单接口
axios.post('请求接口为unifiedorder',data).then(res => {
    
	if (res.code == 200) {
    
		jweixin.config({
    
			debug: false, // 开启调试模式,调用的所有api的返回值会在客户端alert出来，若要查看传入的参数，可以在pc端打开，参数信息会通过log打出，仅在pc端时才会打印。
			appId: res.data.appId, // 必填，公众号的唯一标识
			timestamp: res.data.timeStamp, // 必填，生成签名的时间戳
			nonceStr: res.data.nonceStr, // 必填，生成签名的随机串
			signature: res.data.paySign, // 必填，签名
			jsApiList: ['chooseWXPay'],
		});
		jweixin.chooseWXPay({
    
			appId: res.data.appId,
			timestamp: res.data
				.timeStamp, // 支付签名时间戳，注意微信jssdk中的所有使用timestamp字段均为小写。但最新版的支付后台生成签名使用的timeStamp字段名需大写其中的S字符
			nonceStr: res.data.nonceStr, // 支付签名随机串，不长于 32
			package: res.data.package, // 统一支付接口返回的prepay_id参数值，提交格式如：prepay_id=\*\*\*）
			signType: "MD5", // 签名方式，默认为'SHA1'，使用新版支付需传入'MD5'
			paySign: res.data.paySign, // 支付签名
			success: async function(res1) {
    
				console.log('付款成功！', res1);
				uni.showToast({
    
					title: "付款成功！",
					duration: 1000
				})
			},
			cancel: function(res1) {
    
				console.log('付款取消！', res1);
				uni.showToast({
    
					title: "付款取消！",
					duration: 1000
				})
			},
			fail: function(res1) {
    
				console.log('付款失败！', res1);
				uni.showToast({
    
					title: "付款失败！",
					duration: 1000
				})
			}
		});
	}
})