JavaScript对Cookie的操作-设置Cookie、获得Cookie、删除Cookie（非常好用）

function setcookie(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();
//alert(document.cookie);
}
function getcookie(name)
{
var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
if(arr != null)
{
return unescape(arr[2]);
}
else
{
return "";
}
}
function delcookie(name)
{
var exp = new Date();
exp.setTime(exp.getTime() - 10000);
document.cookie = name + "=a; expires=" + exp.toGMTString();

}