How to implement time countdown in Javascript example?-JS Tutorial-php.cn

How to implement time countdown in Javascript example?

黄舟

Release： 2017-07-17 11:46:47

Original

1486 people have browsed it

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>

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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>

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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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