function showNav(){
var show = document.getElementById("showNav").style.display;console.log(show);
if("none" == show || ""==show)
document.getElementById("showNav").style.display = 'inline';
else
document.getElementById("showNav").style.display = 'none';
}
var aaa=function(){
document.getElementById("qrcode").style.display="inline";
};
var bbb=function(){
document.getElementById("qrcode").style.display="none";
};
