JS实现的网页倒计时数字时钟效果_javascript技巧

<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 == "" &#63; (timer = setInterval(updateTime, 1000), updateTime()) : (clearInterval(timer));<br /> this.className = this.className == '' &#63; "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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