//设置cookie
function setCookie(cname,cvalue,exdays)
{
var d = new Date();
d.setTime(d.getTime()+(exdays*24*60*60*1000));
var expires = "expires="+d.toGMTString();
document.cookie = encodeURIComponent(cname) + "=" + encodeURIComponent(value) + "; " + expires;
}
//获取cookie
function getCookie(cname)
{
var name = cname + "=";
var ca = document.cookie.split(';');
for(var i=0; i<ca.length; i++)
{
var c = ca[i].trim();
if (c.indexOf(name)==0) return c.substring(name.length,c.length);
}
return "";
}
// 删除cookie
function unsetCookie(name) {
document.cookie = name + "= ; expires=" + new Date(0);
}