javascript中的clearInterval函数问题

Question

需要清除currenttime >= deliverytime的间隔。现在函数调用即使条件为真，倒计时也为负。如果remainingTime到达＆＃39; 00＆＃39，则需要停止计时器;

＆＃13;

＆＃13;

<script> 
function startTimer(duration, display) {
var timer = duration, minutes, seconds;
t= setInterval(function () {
	minutes = parseInt(timer / 60, 10)
	seconds = parseInt(timer % 60, 10);

	minutes = minutes < 10 ? "0" + minutes : minutes;
	seconds = seconds < 10 ? "0" + seconds : seconds;

	display.textContent = minutes + ":" + seconds;

	if (--timer < 0) {
	   // timer = duration;
	   clearInterval(t);
	}
}, 1000);
}
function test(){
var x = new Date(); 
var h = x.getHours(); 
var m = x.getMinutes();
var dd=new Date(new Date().getTime()).toLocaleString();
var d = Date.parse(dd) / 1000;
var ct=new Date(new Date().getTime()).toLocaleTimeString();

var currenttime = d;
var alarmtime=$("#alarmHidden").val();
var deliverytime=$("#deliveryHidden").val();
var remainingTime=parseFloat(deliverytime)-parseFloat(d);
if((currenttime >= alarmtime) && (currenttime <= deliverytime)){
	var fiveMinutes =remainingTime;
	
	display = document.querySelector(\'#time\');
	startTimer(fiveMinutes, display);
}
if(currenttime >= deliverytime){
	clearInterval(s);
	clearInterval(t);

}
}
var s=setInterval(function(){ test();  }, 1000);	
</script>

＆＃13;

＆＃13;

＆＃13;