javascript存取cookie

<script>
    function getCookie(name){
        var cookieArray=document.cookie.split("; "); //得到分割的cookie名值对
        var cookie=new Object();
        for (var i=0;i<cookieArray.length;i++){
           var arr=cookieArray[i].split("=");       //将名和值分开
           if(arr[0]==name)return unescape(arr[1]); //如果是指定的cookie，则返回它的值
        }
        return "";
    }

    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();
    }
</script>