form不提交問題

var confirmOrderForm=document.getElementById("confirmOrderForm");
var url="${pageContext.request.contextPath }/confirmOrder/confirmOrder.action?team=aa";
alert(url);
confirmOrderForm.action=url;

confirmOrderForm.submit();

怎麼搞到了action裏team都未空啊。鬱悶好久，才發現<form id="confirmOrderForm">忘添加method="post"