setInterval和clearInterval

Question

睡前做一些工作，无法想象出问题所在。我确定某些东西超出范围或者其他东西：/做了一个小提琴。

https://jsfiddle.net/Luauabzg/

$("button").click(function(){
                    var input = $(this).text();
                    if(input === "Pause")
                    {
                        clearInterval(myVar);
                        clearInterval(myVar2);
                    }
                    if(input === "Reset")
                    {
                        clearInterval(myVar);
                        clearInterval(myVar2);
                        display = "00:00";
                        $(".session-time-clock").text(display);
                        $(".break-time-clock").text(display);
                        breakTimer = "00:00";
                        sessionTimer = "00:00";
                    }
                });

            myVar = setInterval(myTimer, 1000);

            function myTimer() {
                sessionSeconds--;
                var minutes = Math.floor(sessionSeconds/60);
                if(minutes < 10)
                    {
                        minutes = "0" + minutes;
                    }
                if(minutes < 1)
                    {
                        minutes = "00";
                    }
                var seconds = sessionSeconds - minutes *60;
                if(seconds < 10)
                    {
                        seconds = "0" + seconds;
                    }
                var time = minutes + ":" + seconds;
                $(".session-time-clock").text(time);
                if(minutes === "00" && seconds === "00")
                    {
                        clearInterval(myVar);
                        $(".session-time-clock").text(sessionTimer);
                        myVar2 = setInterval(myTimer2, 1000);
                    }
            }

            function myTimer2() {
                breakSeconds--;
                var minutes = Math.floor(breakSeconds/60);
                if(minutes < 10)
                    {
                        minutes = "0" + minutes;
                    }
                if(minutes < 1)
                    {
                        minutes = "00";
                    }
                var seconds = breakSeconds - minutes *60;
                if(seconds < 10)
                    {
                        seconds = "0" + seconds;
                    }
                var time = minutes + ":" + seconds;
                $(".break-time-clock").text(time);
                if(minutes === "00" && seconds === "00")
                    {
                        clearInterval(myVar2); 
                        $(".break-time-clock").text(breakTimer);
                        myVar = setInterval(myTimer, 1000);
                    }
            }

        }

});

我希望将会话计时器倒计时设置为0，然后重置为输入的值，然后在没有用户输入的情况下，break计时器执行相同的操作并切换回来。最终我希望绿色圆圈缩小，百分比随着时间的推移而减少。如果需要澄清任何需要澄清的话我会发出通知，我会在早上回复。