js关于cookie的各种方法

//删除cookie
delCookie("GroupName");
//s20是代表20秒
//h是指小时，如12小时则是：h12
//d是天数，30天则：d30
setCookie("GroupName", tname, "d1");

///////////////////////////////////////////////////////////////////////////////////////////

//获取cookie

function getCookie(name) {
            var arr, reg = new RegExp("(^| )" + name + "=([^;]*)(;|$)");
            if (arr = document.cookie.match(reg))
                return unescape(arr[2]);
            else
                return "";
        }

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

//设置cookie
        function setCookie(name, value, time) {
            var strsec = getsec(time);
            var exp = new Date();
            exp.setTime(exp.getTime() + strsec * 1);
            document.cookie = name + "=" + escape(value) + ";expires=" + exp.toGMTString();
        }

//设置cookie过期时间
        function getsec(str) {          
            var str1 = str.substring(1, str.length) * 1;
            var str2 = str.substring(0, 1);
            if (str2 == "s") {
                return str1 * 1000;
            }
            else if (str2 == "h") {
                return str1 * 60 * 60 * 1000;
            }
            else if (str2 == "d") {
                return str1 * 24 * 60 * 60 * 1000;
            }
        }