一段挺好用的js函数 getcookie() addcookie

    function getcookie(name){
    var strcookie=document.cookie;
    var arrcookie=strcookie.split("; ");
    for(var i=0;i<arrcookie.length;i++){
    var arr=arrcookie[i].split("=");
    if(arr[0]==name)return arr[1];
    }
    return "";
}

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+"; path=/;expires="+exp.toGMTString();
}

function addcookie(name,value,expireHours){
var cookieString=name+"="+escape(value)+"; path=/";
//判断是否设置过期时间
if(expireHours>0){
var date=new Date();
date.setTime(date.getTime+expireHours*3600*1000);
cookieString=cookieString+"; expire="+date.toGMTString();
}
document.cookie=cookieString;
}