form不提交问题

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

confirmOrderForm.submit();

怎么搞到了action里team都未空啊。郁闷好久，才发现忘添加method="post"