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How to implement time countdown in Javascript example?

黄舟Original: 2017-07-17 11:46:471460browse

javascriptRealize the countdown effect

In WINFORM, the time control is generally used to complete the timing operation. The timing operation in the web page can use javascript

, Today I wrote a countdown example with JS. This example shows the homepage of 5, 4, 3, 2, and 1 on the page.

Front page:

        <p>将在 <span id="mes">5</span> 秒钟后返回首页！</p>

The javascript code is as follows:

 <script language="javascript" type="text/javascript">
        var i = 5;
        var intervalid;
        intervalid = setInterval("fun()", 1000);
        function fun() {
            if (i == 0) {
                window.location.href = "default.aspx";
                clearInterval(intervalid);
            }
            document.getElementById("mes").innerHTML = i;
            i--; 
        }
        </script>

The Date class is used here

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>日期类倒计时</title>
    <script type="text/javascript">
      window.onload=function(){
        var op=document.getElementById("time");
        var obtn=document.getElementById("btn");
        var omusic=document.getElementById("music");
        obtn.onclick=function(){//按钮点击 音乐停止播放
          omusic.pause();
        }
        function totwo(e){
          return e<10?"0"+e:""+e;//如果取得的数字为个数则在其前面增添一个0
        }
        function go(){//把获取时间的功能封装到函数内    注意 时间要向下取整避免小数
            var time1=new Date();//获取当前时间 获取的市1970年1年1月日到现在的毫秒数(必须写在函数或者定时器内 每一次变化都要重新获取当前时间)
            var time2=new Date(2017,9,27,17,20,10);//设置需要到达的时间 也是获取的毫秒数
            var conS=Math.floor((time2.getTime()-time1.getTime())/1000);//获得差值除以1000转为秒
            var day=totwo(Math.floor(conS/86400));// 差值/60/60/24获取天数
            var hour=totwo(Math.floor(conS%86400/3600)); //  取余/60/60获取时(取余是获取conS对应位置的小数位)
            var min=totwo(Math.floor(conS%86400%3600/60));// 取余/60获取分
            var s=totwo(Math.floor(conS%60)); //取总秒数的余数
            var html="倒计时"+day+"天"+hour+"时"+min+"分"+s+"秒"; 
            op.innerHTML=html;//把字符串添加进p中
            if(conS<0){//倒计时完成 执行功能，这里是播放MP3
              clearInterval(time);//执行功能时要清除时间函数
              omusic.play();
              op.innerHTML="春节快乐！";
            }          
        }
        go();//调用函数
        var time=setInterval(go,1000);//设置定时器 每一秒执行一次
      }
    </script>
  </head>
  <body>
    <button id="btn">停止</button>
    <audio src="music.mp3" id="music"></audio>
    <p id="time"></p>
  </body> 
</html>

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