我如何确保计时器设置为每天半个4，这样我就不必在Javascript中提到某个日期了？此外，如何可能以div或p而不是形式显示输出。
<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<title>jQuery Countdown</title>
</head>
<body>
<script language="javascript" type="text/javascript">
function getTime() {
now = new Date();
orderBy = new Date("May 17 2016 16:30:00");
//days = (orderBy - now) / 1000 / 60 / 60 / 24;
daysRound = Math.floor(days);
hours = (orderBy - now) / 1000 / 60 / 60 - (24 * daysRound);
hoursRound = Math.floor(hours);
minutes = (orderBy - now) / 1000 /60 - (24 * 60 * daysRound) - (60 * hoursRound);
minutesRound = Math.floor(minutes);
seconds = (orderBy - now) / 1000 - (24 * 60 * 60 * daysRound) - (60 * 60 * hoursRound) - (60 * minutesRound);
secondsRound = Math.round(seconds);
sec = (secondsRound == 1) ? "" : "";
min = (minutesRound == 1) ? " : " : " : ";
hr = (hoursRound == 1) ? " : " : " : ";
//dy = (daysRound == 1) ? " day" : " days, ";
document.timeForm.input1.value = "Check again before " + hoursRound + hr + minutesRound + min + secondsRound + sec;
newtime = window.setTimeout("getTime();", 1000);
}
window.onload=getTime;
if (days = 0){
days.style.display = "none";
}
</script>
<form name=timeForm>
<input type=text name=input1 size=50 border-style="none" style="display: block; border: none; font-size: 14px; font-family: sans-serif">
</form>
</body>
</html><!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<title>jQuery Countdown</title>
</head>
<body>
<script language="javascript" type="text/javascript">
function getTime() {
now = new Date();
/*
Use todays date to calculate tomorrows alarm
*/
var day = now.getDate()
/*console.log('today: ' + day)*/
var monthsAbbrev = [
"Jan",
"Feb",
"Mar",
"Apr",
"May",
"June",
"July",
"Aug",
"Sept",
"Oct",
"Nov",
"Dec"
];
var index = now.getMonth()
var month = monthsAbbrev[ index ]
/*console.log('month: ' + month)*/
var year = now.getFullYear()
/*console.log('year: ' + year)*/
var monthsWith31days = [
"Jan",
"Mar",
"May",
"July",
"Aug",
"Oct",
"Dec"
];
var monthsWith30days = [
"Apr",
"June",
"Sept",
"Nov"
];
var alarm = "04:30:00 PM"
var time = now.toLocaleTimeString() /* "HH:MM:ss AM/PM" */
/*console.log('time: ' + time)
console.log('is it true??' + (time >= alarm))*/
if (time >= alarm) {
console.log('today is ' + day)
var maxIs31 = new RegExp("(" + monthsWith31days.join("|") + ")").test(month)
var maxIs30 = new RegExp("(" + monthsWith30days.join("|") + ")").test(month)
var monthIsFeb = /(Feb)/.test(month)
/*console.log('maxIs31: ' + maxIs31)
console.log('maxIs30: ' + maxIs30)
console.log('monthIsFeb: ' + monthIsFeb)*/
if (maxIs31) {
(day >= 31) ? (day = 1) : ( day +=1 )
} else if (maxIs30) {
(day >= 30) ? (day = 1) : ( day +=1 )
} else if (monthIsFeb) {
if (parseInt(year, 10) % 4 === 0) {
/* its a leap year */
(day >= 29) ? (day = 1) : ( day += 1 )
} else {
(day >= 28) ? (day = 1) : ( day += 1 )
}
}
console.log('tomorrow wil be?? ' + day)
}
/*
Now set tomorrows alarm only if its gone off today
*/
orderBy = new Date( month +" "+ day +" "+ year +" "+ alarm );
days = (orderBy - now) / 1000 / 60 / 60 / 24;
daysRound = Math.floor(days);
hours = (orderBy - now) / 1000 / 60 / 60 - (24 * daysRound);
hoursRound = Math.floor(hours);
minutes = (orderBy - now) / 1000 /60 - (24 * 60 * daysRound) - (60 * hoursRound);
minutesRound = Math.floor(minutes);
seconds = (orderBy - now) / 1000 - (24 * 60 * 60 * daysRound) - (60 * 60 * hoursRound) - (60 * minutesRound);
secondsRound = Math.round(seconds);
sec = (secondsRound == 1) ? "" : "";
min = (minutesRound == 1) ? " : " : " : ";
hr = (hoursRound == 1) ? " : " : " : ";
//dy = (daysRound == 1) ? " day" : " days, ";
document.timeForm.input1.value = "Check again before " + hoursRound + hr + minutesRound + min + secondsRound + sec;
newtime = window.setTimeout("getTime();", 1000);
}
window.onload=getTime;
if (days = 0){
days.style.display = "none";
}
</script>
<form name="timeForm">
<input type="text" name="input1" size="50" border-style="none" style="display: block; border: none; font-size: 14px; font-family: sans-serif">
</form>
</body>
</html>