js存、取、删除cookie

//写cookies函数 
function SetCookie(name,value)//两个参数，一个是cookie的名子，一个是值 
{ 
    var Days = 30; //此 cookie 将被保存 30 天 
    var exp  = new Date();    //new Date("December 31, 9998"); 
    exp.setTime(exp.getTime() + Days*24*60*60*1000); 
    document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString(); 
} 
function getCookie(name)//取cookies函数        
{ 
    var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)")); 
     if(arr != null) return unescape(arr[2]); return null; 

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

SetCookie ("xiaoqi", "3") 
alert(getCookie('xiaoqi')); 
</script>