设置cookie的path
//删除cookies
function delCookie(name) {
var exp = new Date();
exp.setTime(exp.getTime() + (-1 * 24 * 60 * 60 * 1000));
var cval = getCookie(name);
if (cval != null)
document.cookie = name + "=" + cval + "; expires=" + exp.toUTCString()+";path=/";
}