本文實例講述了JS實現的網頁倒計時數字時鐘效果。分享給大家供大家參考。具體實現方法如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>javascript實現的倒計時時鐘</title><style>body,div{margin:0;padding:0;}body{color:#fff;font:16px/1.5 /5fae/8f6f/96c5/9ed1;}#countdown{width:300px;text-align:center;background:#1a1a1a;margin:10px auto;padding:20px 0;}input{border:0;width:283px;height:50px;cursor:pointer;margin-top:20px;background:url(http://www.49028c.com/jscss/demoimg/201210/btn-1.png) no-repeat;}input.cancel{background-position:0 -50px;}span{color:#000;width:80px;line-height:2;background:#fbfbfb;border:2px solid #b4b4b4;margin:0 10px;padding:0 10px;}</style><script>window.onload = function (){var oCountDown = document.getElementById("countdown");var aInput = oCountDown.getElementsByTagName("input")[0];var timer = null;aInput.onclick = function (){this.className == "" ? (timer = setInterval(updateTime, 1000), updateTime()) : (clearInterval(timer));this.className = this.className == '' ? "cancel" : '';};function format(a){return a.toString().replace(/^(/d)$/,'0$1')}function updateTime (){var aSpan = oCountDown.getElementsByTagName("span");var oRemain = aSpan[0].innerHTML.replace(/^0/,'') * 60 + parseInt(aSpan[1].innerHTML.replace(/^0/,''));if(oRemain <= 0){clearInterval(timer);return}oRemain--;aSpan[0].innerHTML = format(parseInt(oRemain / 60));oRemain %= 60;aSpan[1].innerHTML = format(parseInt(oRemain));}}</script></head><body><div id="countdown"><span>01</span>分鐘<span>40</span>秒<input type="button" value="" /></div></body></html>通過本文的了解。希望本文所述對大家JS程序設計有所幫助。
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