Web page countdown digital clock effect implemented by JS_javascript skills

The example in this article describes the web page countdown digital clock effect implemented by JS. Share it with everyone for your reference. The specific implementation method is as follows:

Copy code The code is as follows:

<script><br> window.onload = function ()<br> {<br> var oCountDown = document.getElementById("countdown");<br> var aInput = oCountDown.getElementsByTagName("input")[0];<br> var timer = null;<br> aInput.onclick = function ()<br> {<br> this.className == "" ? (timer = setInterval(updateTime, 1000), updateTime()) : (clearInterval(timer));<br> this.className = this.className == '' ? "cancel" : '';<br> };<br> function format(a)<br> {<br> return a.toString().replace(/^(d)$/,'0$1')<br> }<br> function updateTime ()<br> {<br> var aSpan = oCountDown.getElementsByTagName("span");<br> var oRemain = aSpan[0].innerHTML.replace(/^0/,'') * 60 parseInt(aSpan[1].innerHTML.replace(/^0/,''));<br> if(oRemain <= 0)<br /> {<br /> clearInterval(timer);<br /> return<br /> }<br /> oRemain--;<br /> aSpan[0].innerHTML = format(parseInt(oRemain / 60));<br /> oRemain %= 60;<br /> aSpan[1].innerHTML = format(parseInt(oRemain));<br /> }<br /> }<br /> </script>

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