var cookie = {
    /**
     * 设置cookie
     * 
     * @param name 
     * @param value 
     */
    setCookie: function(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();
    },

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

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