Vue实现微信支付功能遇到的坑

<el-radio v-model="radio" label="weixin" >
   <i class="iconfont icon-weixin"></i>
   <div class="list">
   <h5>微信支付</h5>
   <span>推荐安装最新版微信使用</span>
   </div>
  </el-radio>
  <el-radio v-model="radio" label="zhifubao">
   <i class="iconfont icon-zhifubao"></i>
   <div class="list">
   <h5>支付宝</h5>
   <span>推荐有支付宝账户的用户使用</span>
   </div>
  </el-radio>

this.code = ''
     var local = window.location.href // 获取页面url
     var appid = '' 
     this.code = getUrlCode().code // 截取code
     if (this.code == null || this.code === ''){
     window.location.href = `https://open.weixin.qq.com/connect/oauth2/authorize?appid=${appid}&redirect_uri=${encodeURIComponent(local)}&response_type=code&scope=snsapi_base&state=123#wechat_redirect`
     };
     
function getUrlCode(){
         var url = location.search
         // this.winUrl = url
         // alert(this.winUrl)
         var theRequest = new Object()
         if (url.indexOf("?") != -1){
          var str = url.substr(1)
           var strs = str.split("&")
           for(var i = 0; i < strs.length; i ++){
            theRequest[strs[i].split("=")[0]]=(strs[i].split("=")[1])
           }
         }
          return theRequest 
         };

methods:{
  Compay(){
  
  let radio_data = this.radio
  if(radio_data == 'weixin'){
   if (this.code) { // 如果没有code，则去请求
           
         this.$axios({
          method: "post",
       url: "后台接口",
       params: {code: this.code} //将code传给后台，如果有其他参数需要传递，请一并传递
         }).then((res)=>{
    //调取微信支付
    var that = this;
        function onBridgeReady(){
           WeixinJSBridge.invoke("getBrandWCPayRequest",{
           appId: res.data.appId, //公众号名称，由商户传入
            timeStamp: res.data.timeStamp, //时间戳，自1970年以来的秒数
            nonceStr: res.data.nonceStr, //随机串
            package: res.data.package,
            signType: res.data.signType, //微信签名方式：
            paySign: res.data.paySign //微信签名sign
           },
           function(res){
           if (res.err_msg == "get_brand_wcpay_request:ok"){
            alert('恭喜您，支付成功！')
           }else if(res.err_msg == "get_brand_wcpay_request:cancel"){
            alert('支付失败！');
           }else if (res.err_msg == "get_brand_wcpay_request:fail"){
            alert('调起微信支付失败');
           }
           }
           );
        }
        onBridgeReady();
        //微信支付
         })
         }
  }else if(radio_data == 'zhifubao'){
  this.$axios.post('后台接口',data).then((res)=> {
           this.html = res.data
           var form= res.data;
          const div = document.createElement('div') //创建div
          div.innerHTML = form//此处form就是后台返回接收到的数据
          document.body.appendChild(div)
          var queryParam = '';   Array.prototype.slice.call(document.querySelectorAll("input[type=hidden]")).forEach(function (ele) {
     queryParam += '&' + ele.name + "=" + encodeURIComponent(ele.value);
   });
    var gotoUrl = document.querySelector("#alipaysubmit").getAttribute('action') + queryParam;
   _AP.pay(gotoUrl); //在微信中用浏览器跳转到支付宝支付
  })
  }
  
  }
 }