新加入一个项目的集中开发,遇到一个需要倒计时的需求,经过测试,有以下几种方案,分享出来:
方案一:
页面Html:
- <span style="font-size:18px;"><html>
- <head>
- <meta charset="utf-8">
- </head>
- <body onload="timeCounter('timeCounter')">
- <p id="timeCounter">2:00:00</p>
- </body>
- </html></span>
JavaScript代码:
- <span style="font-size:18px;"><script>
- var timeCounter = (function () {
- var int;
- var timeID = SumTime().split(":");
- var total =parseInt(timeID[0] * 3600) + parseInt(timeID[1] * 60) + parseInt(timeID[2]);//将时间换算成秒数
- return function (elemID) {
- obj = document.getElementById(elemID);
- var s = (total % 60) < 10 ? ('0' + total % 60) : total % 60;//秒
- var h = total / 3600 < 10 ? ('0' + parseInt(total / 3600)) : parseInt(total / 3600);//时
- var m = (total - h * 3600) / 60 < 10 ? ('0' + parseInt((total - h * 3600) / 60)) : parseInt((total - h * 3600) / 60);//分
- obj.innerHTML = h + ' : ' + m + ' : ' + s;
- total--;
- int = setTimeout("timeCounter('" + elemID + "')", 1000);
- if (total < 0) clearTimeout(int);
- }
- })()
- function SumTime() {
- var ap = new Date().toLocaleTimeString().substring(0, 2);
- var startTime = new Date().toLocaleTimeString().substring(2);
- var endTime = "15:00:00";
- var start = new Array;
- var end = new Array;
- start = startTime.split(":");
- end = endTime.split(":");
- var hh = end[0] - start[0];
- if (ap == "下午" || ap=="PM") { hh -= 12;}
- if (end[1] < start[1]) {
- hh -= 1;
- var mm = end[1] + 60 - start[1];
- } else {
- var mm = end[1] - start[1];
- }
- if (end[2] < start[2]) {
- mm -= 1;
- var ss = end[2] + 60 - start[2];
- } else {
- var ss = end[2] - start[2];
- }
- var diffTime = hh + ":" + mm + ":" + ss;
- return diffTime;
- }
- </script></span>
方案二:
- <span style="font-size:18px;"><meta charset="utf-8">
- <div>
- <span id='daya'></span>天
- <span id='hoursa'></span>小时
- <span id='minua'></span>分
- <span id='secoa'></span>秒
- </div></span>
js:
- <span style="font-size:18px;"><script type="text/javascript">
- var a=7200; //以毫秒为单位
- function fomtime()
- {
- a=a-1000;
- var b=new Date();
- b.setTime(0);
- var c=new Date();
- c.setTime(a);
- var day1=b.getDate(); //为方便调用,把天数、小时等单独定义
- var hours1=b.getHours();
- var minu1=b.getMinutes();
- var seco1=b.getSeconds();
- var day2=c.getDate();
- var hours2=c.getHours();
- var minu2=c.getMinutes();
- var seco2=c.getSeconds();
- var day=day2-day1;
- var hours=hours2-hours1;
- var minu=minu2-minu1;
- var seco=seco2-seco1;
- document.getElementById('daya').innerHTML=day;
- document.getElementById('hoursa').innerHTML=hours;
- document.getElementById('minua').innerHTML=minu;
- document.getElementById('secoa').innerHTML=seco;
- setTimeout("fomtime()",1000);
- }
- fomtime();
- </script></span>
方案三:
- <span style="font-size:18px;"><script>
- var second = 7200; // 剩余秒数
- // 写一个方法,将秒数专为天数
- var toDays = function(){
- var s = second % 60; // 秒
- var mi = (second - s) / 60 % 60; // 分钟
- var h = ((second - s) / 60 - mi ) / 60 % 24; // 小时
- var d = (((second - s) / 60 - mi ) / 60 - h ) / 24 // 天
- return d + "天" + h + "小时" + mi + "分钟" + s + "秒";
- }
- //定时器
- window.setInterval(function(){
- second --;
- document.getElementById("showTimes").innerHTML = toDays ();
- }, 1000);
- </script>
- <p id="<span margin: 0px; padding: 0px; border: currentColor; color: black; background-color: inherit;">font-family: Arial, Helvetica, sans-serif;">timeCounter</span>"></p></span>
总结:
总结一下上面的集中方法,其实就是一种方法:将时间差转化为以秒为单位的数,然后写定时器美妙执行一次时间变化,只是这个变化的方式稍有不同,但是都离不开SetTimeout延时这个方法,另一个就是window的setInterval设置时间间隔,思想是一样的。