WX支付功能的调用

1.引入js。

2.微信支付的js。此处有的理解不知对不对，是照着老大的例子整改的~

$('.button').click(function () {
         var giftId = $('.show').parent().attr('id');
        var Storage = window.localStorage;
        var toUserId = Storage.getItem("contest_id");
        var formUserId = Storage.getItem('userid');
        var wechatid = Storage.getItem('wechat_id');
         if(giftId!=undefined){         
                 $.post(config.api+ "/public/order",
                     {giftId: giftId, openid: wechatid, formUserId: formUserId, toUserId: toUserId},
                     function (data) {
                       /*  alert("success");*/
                         WeixinJSBridge.invoke(
                             'getBrandWCPayRequest'
                             , {
                                 "appId": data.appId,
                                 "nonceStr": data.nonceStr,
                                 "package": data.package,
                                 "paySign": data.paySign,
                                 "signType": data.signType,
                                 "timeStamp": data.timeStamp
                             }
                             , callback
                         );

                     });

                 function callback(res) {
                     //  返回 res.err_msg,取值
                     WeixinJSBridge.log(res.err_msg);
                     if (res.err_msg == 'get_brand_wcpay_request:ok') {
                         alert("支付成功");
                         history.go(-1);
                     } else {
                         var msg = '支付失败,请重新支付.';
                     }
                 }
         }else{
                alert("请选择礼物");
         }
     })