js实现倒计时
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2024-02-26 21:31:52
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直接上代码：
<body>
<div id="time">
年: <input type="number" min="2017" max="2020" value="2017" /></br>
月: <input type="number" min="1" max="12" value="1" /></br>
日: <input type="number" min="1" max="31" value="27" />
<p><button id="btn1">开始倒计时</button><button id="btn2">停止倒计时</button></p>
<p>现在距离:<b>2017 年 1 月 27 日</b> 还剩 </p>
<div id="start">
<span>00</span>天
<span>00</span>小时
<span>00</span>分
<span>00</span>秒
</div>
</div>
</body> <script>
function $(el) {
if(typeof(el) == 'string') {
return(document.getElementById(el));
}
return(el);
}
function fillZero(num, digit) {
var str = '' + num;
if(str.length < digit) {
str = '0' + str;
}
return str;
}
window.onload = function() {
var oDiv1 = $('time');
var aInput = oDiv1.getElementsByTagName('input');
var oYear = aInput[0]; //年
var oMonth = aInput[1]; //月
var oDay = aInput[2] //日
var oDiv2 = $('start');
var aSpan = oDiv2.getElementsByTagName('span');
var sTxtDay = aSpan[0]; //天
var sTxtHour = aSpan[1] //小时
var sTxtMin = aSpan[2] //分
var sTxtSec = aSpan[3] //秒
var oTxtTarget = document.getElementsByTagName('b')[0];
var timer = null;
$('btn1').onclick = function() {
timer = setInterval(updateTime, 1000);
updateTime();
}
$('btn2').onclick = function() {
clearInterval(timer);
}
function updateTime() {
var sYear = Math.abs(oYear.value);
var sMonth = Math.abs(oMonth.value);
var sDay = Math.abs(oDay.value);
if(sMonth > 12 || sDay > 31){
clearInterval(timer);
alert('嗯哼');
return;
}
oTxtTarget.innerHTML = sYear + ' 年 ' + sMonth + ' 月 ' + sDay + ' 日 ';
var oEndDate = new Date(sYear, (sMonth - 1), sDay);
var oNowDate = new Date();
var iRemain = 0;
iRemain = parseInt((oEndDate.getTime() - oNowDate.getTime()) / 1000);
if(iRemain <= 0) { //判断开始时间是否小于或等于今天
clearInterval(timer);
iRemain = 0;
alert('请输入大于今天的时间');
}
var iDay = parseInt(iRemain / 86400); //剩余天数
iRemain %= 86400;
var iHour = parseInt(iRemain / 3600); //剩余小时
iRemain %= 3600;
var iMin = parseInt(iRemain / 60); //剩余分钟
iRemain %= 60;
var iSec = iRemain; //剩余秒
sTxtDay.innerHTML = fillZero(iDay, 2);
sTxtHour.innerHTML = fillZero(iHour, 2);
sTxtMin.innerHTML = fillZero(iMin, 2);
sTxtSec.innerHTML = fillZero(iSec, 2);
}
}
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