點擊獲取驗證碼后60秒內禁止重新獲取（防刷新）

<script>
        $(function(){

            /*防刷新：檢測是否存在cookie*/
            if($.cookie("captcha")){
                var count = $.cookie("captcha");
                var btn = $('#getting');
                btn.val(count+'秒后可重新獲取').attr('disabled',true).css('cursor','not-allowed');
                var resend = setInterval(function(){
                    count--;
                    if (count > 0){
                        btn.val(count+'秒后可重新獲取').attr('disabled',true).css('cursor','not-allowed');
                        $.cookie("captcha", count, {path: '/', expires: (1/86400)*count});
                    }else {
                        clearInterval(resend);
                        btn.val("獲取驗證碼").removeClass('disabled').removeAttr('disabled style');
                    }
                }, 1000);
            }

            /*點擊改變按鈕狀態，已經簡略掉ajax發送短信驗證的代碼*/
            $('#getting').click(function(){
                var btn = $(this);
                var count = 60;
                var resend = setInterval(function(){
                    count--;
                    if (count > 0){
                        btn.val(count+"秒后可重新獲取");
                        $.cookie("captcha", count, {path: '/', expires: (1/86400)*count});
                    }else {
                        clearInterval(resend);
                        btn.val("獲取驗證碼").removeAttr('disabled style');
                    }
                }, 1000);
                btn.attr('disabled',true).css('cursor','not-allowed');
            });

        });
</script>