js dynamic Post request prevents parameters from being displayed in the input bar

Dynamically make Post requests

var f=document.createElement('form');
f.style.display='none';
f.action=Feng.ctxPath+"/xxx/xxxxxx";
f.method='post';
// put the parameters that need to be passed here
f.innerHTML="<input type='hidden' name='toStep' value='3'/><input type='hidden' name='account' value="+$('#loginname').val()+"></input>";
document.body.appendChild(f);
// submit request
f.submit();

Benefit: Prevents parameters from being displayed in the input field