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js倒计时效果的几个案例

1.简单的显示年月日、星期、时间

技术分享
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>当前系统时间</title>
<link rel="stylesheet" href="style.css"  />
<script language="javascript" type="text/javascript">

  window.onload = function(){
    showTime();
  }
  function checkTime(i){  //补位处理
    var i;  
    if(i<10){
        i="0"+i;
    }
    return i;
  }
  function showTime(){
    var now=new Date();
    var year=now.getFullYear() ;
    var month=now.getMonth()+1;
    var day=now.getDate();
    var h=now.getHours();
    var m=now.getMinutes();
    var s=now.getSeconds();
    m=checkTime(m);
    s=checkTime(s);
    var d=now.getDay();
    var weekday=new Array(7)
    weekday[0]="星期日"
    weekday[1]="星期一"
    weekday[2]="星期二"
    weekday[3]="星期三"
    weekday[4]="星期四"
    weekday[5]="星期五"
    weekday[6]="星期六"

    document.getElementById("show").innerHTML=""+year+""+month+""+day+""+weekday[d]+h+":"+m+":"+s;
    t=setTimeout(showTime(),500);
  }

</script>
</head>
<body>
<div class="content1">
  <div id="show">显示时间的位置</div> 
</div>
</body>
</html>
View Code

2.制作倒计时

技术分享
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>研究生考试时间</title>
<link rel="stylesheet" href="style.css"  />
<script type="text/javascript">     
  window.onload = function(){
  var timedate= new Date("2017,12,25");     //自定义结束时间  
  var now =  new Date() ;    //获取当前时间
  var date = timedate.getTime() - now.getTime();    //得出的为毫秒
  var time = Math.ceil(date/(1000*60*60*24))  ;  //1000 * 60 * 60 * 24一天的秒数
    if(time > 0 ){
      document.getElementById(timeShow).innerHTML = time;
    }else{
        alert("时间已经到了");
    }
    }   
</script>
</head>
<body>
   <div class="content2">
    <div class="txtshow">距离设置时间还有<span  id="timeShow"></span></div>
   </div>
</body>
</html>
View Code

 

js倒计时效果的几个案例