<script type="text/javascript">
function jsApiCall()
{
   WeixinJSBridge.invoke(
      'getBrandWCPayRequest',
<?php echo $jsApiParameters; ?>,
function(res){          
         WeixinJSBridge.log(res.err_msg);
if(res.err_msg!='get_brand_wcpay_request:ok'){
            alert('支付取消.');
history
 
.back(-1);
}
         window.location.href="<?php echo $return_url;?>";
}
   );
}
function callpay()
{
   if (typeof WeixinJSBridge == "undefined"){
       if( document.addEventListener ){
           document.addEventListener('WeixinJSBridgeReady', jsApiCall, false);
}else if (document.attachEvent
 
){
           document.attachEvent('WeixinJSBridgeReady', jsApiCall); 
document.attachEvent('onWeixinJSBridgeReady', jsApiCall);
}
   }else{
       jsApiCall();
}
}
callpay();
</script>