cookie按钮点击倒计时

<!--引入jquery.cookie.js 插件-->
<script src="js/jquery.js" type="text/javascript" charset="utf-8"></script>
<script src="js/jquery.cookie.js" type="text/javascript" charset="utf-8"></script>
<!--逻辑功能代码 -->
<script>
    $(function(){
        /*仿刷新：检测是否存在cookie*/
        if($.cookie("captcha")){
            var count = $.cookie("captcha");
            var btn = $('#getting');
            btn.html(count+'秒后可重新获取').attr('disabled',true).css('cursor','not-allowed');
            var resend = setInterval(function(){
                count--;
                if (count > 0){
                    btn.html(count+'秒后可重新获取').attr('disabled',true).css('cursor','not-allowed');
                    $.cookie("captcha", count, {path: '/', expires: (1/86400)*count});
                }else {
                    clearInterval(resend);
                    btn.html("获取验证码").removeClass('disabled').removeAttr('disabled style');
                }
            }, 1000);
        }
        /*点击改变按钮状态，已经简略掉ajax发送短信验证的代码*/
        $('#getting').click(function(){
            //手机验证码
            var tel = $('#tel').val();
            var btn = $(this);
            var count = 60;
            var resend = setInterval(function(){
                count--;
                if (count > 0){
                    btn.html(count+"秒后可重新获取");
                    $.cookie("captcha", count, {path: '/', expires: (1/86400)*count});
                }else {
                    clearInterval(resend);
                    btn.html("获取验证码").removeAttr('disabled style');
                }
            }, 1000);
            btn.attr('disabled',true).css('cursor','not-allowed');
        });
    });
</script>