js 向form表单中插入数据

var newElement = document.createElement("input");

 var nowtime=year+""+month+day+hour+minute+second;

newElement.setAttribute("name","nowtime");
newElement.setAttribute("value",nowtime);
newElement.style.visibility="hidden";//设置为隐藏
signinform.appendChild(newElement);

原文：http://www.cnblogs.com/earendil/p/4199854.html