Front-end calls WeChat payment interface

Click event of payment button

$(´.Save_Patient_Msg´).click(function(){
    $(´.Save_Patient_Msg´).off(´click´);
    var hrdfId = getOrderId();
    var txnAmt = $(´.sum_pay.font-red´).html(); 
     
    var data = {orderId: hrdfId, txnAmt: "0.01", 
        prodDesc: "远程诊断服务", callType: "JSAPI",
        access_token: getUrlParam("access_token")
    };
    $.ajax({
        type: ´POST´,
        url: ´/hims/api/commonPay/queryTransNo?access_token=´ getUrlParam(´access_token´),
        dataType:´json´,
        contentType:´application/json´,
        data: JSON.stringify(data),
        success: function(Wxres){
          if(!Wxres){
            $.alert(´服务器拥堵，请稍后访问´)
          }else{
              console.log(Wxres);
              if(Wxres.data.respCode == ´fail´){
                $.alert(Wxres.data.respMsg);
              }else{
                 //10 微信支付接口
                    // 10.1 发起一个支付请求
                    // 注意：此 Demo 使用 2.7 版本支付接口实现，建议使用此接口时参考微信支付相关最新文档。
                    var param = Wxres.data;
                    wx.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: ´wx403ead26691402fb´, // 必填，公众号的唯一标识
                        timestamp: param.timestamp, // 必填，生成签名的时间戳
                        nonceStr: param.noncestr, // 必填，生成签名的随机串
                        signature: param.signJs,// 必填，调用js签名，
                        jsApiList: [´chooseWXPay´] // 必填，需要使用的JS接口列表，这里只写支付的
                    });
                    wx.chooseWXPay({
                        timestamp: param.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: param.noncestr, // 支付签名随机串，不长于 32 位
                        package: "prepay_id=" param.transNo, // 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: param.sign, // 支付签名
                        success: function (res) {
                            if(res.errMsg == "chooseWXPay:ok"){
                                //alert("支付成功");
                                window.location.href  = "/hims/weixin/pages/Order_ok.html?access_token=" getUrlParam("access_token");
                            }else{
                                alert(res.errMsg);
                            }
                        },
                        cancel: function(res){
                            //alert(´取消支付´);
                        }
                    });
                }
            }   
        },
        error:function(data){
            var msg =  data.message || data.status;
            $.alert(´服务器错误´ msg);
        }
    });   
    return false;

});

Get url code

function getUrlParam(name){
    //构造一个含有目标参数的正则表达式对象
    var reg = new RegExp("(^|&)"  name  "=([^&]*)(&|$)");
    //匹配目标参数
    var r = window.location.search.substr(1).match(reg);
    //返回参数值
    if (r!=null) return unescape(r[2]); return null;}

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