浏览器Cookie无法删除问题

1、写Cookie时添加路径：

//写cookies，设置过期时间为30天，并设置path为根目录
function setPathCookie(name,value)
{
var Days = 30;
var exp = new Date();
exp.setTime(exp.getTime() + Days*24*60*60*1000);
document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString() + "; path=/";
}

2、删除Cookie时带上路径：

//删除根目录cookie
function delPathCookie(name)
{
var exp = new Date();
exp.setTime(exp.getTime() - 1);
var cval=getCookie(name);
if(cval!=null)
document.cookie= name + "="+cval+";expires="+exp.toGMTString() + "; path=/";
}