【温故而知新-Javascript】时间效果（显示当前时间、显示当前日期、显示页面停留时间、倒计时）

时间：2022-05-22 10:32:19

1.显示当前时间

<body onload="showtime()">

<div>当前时间：

<span id="clock"></span >

</div>

<script type="application/javascript">

function showtime()//创建函数

{

    var nowTime = new Date();//创建时间对象实例

    var hours = nowTime.getHours();//获取当前小时数

    var minutes = nowTime.getMinutes();//获取当前分钟数

    var seconds = nowTime.getSeconds();//获取当前秒数

    var timer = " "+((hours>12)?hours-12:hours);//将小时数质赋予变量timer

    timer +=((minutes<10)?"0:":":")+minutes;//将分钟数值赋予变量timer

    timer += ((seconds<10)?"0:":":")+seconds;//将秒数值赋予变量timer

    timer +=" "+((hours>12)?"pm":"am");//将字符am或pm赋予变量timer

    document.getElementById('clock').innerHTML =timer;

    setTimeout("showtime()",1000);

}

</script>

</body>

2.显示当前日期

<body onload="initArray()">

<div> <span id="todayIs"></span></div>

<script type="application/javascript">

function initArray()

{

    var today = new Date();

    var d = new Array(

    "星期日","星期一","星期二","星期三","星期四","星期五","星期六")

    //如果为2014年，getYear返回2014-1900=114，getFullYear返回2014

    var hh="<font color='#FBAE66' style='font-size:9pt;font-family:宋体'>今天是： "+

today.getFullYear()+"年"+(today.getMonth()+1)+"月"+today.getDate()+"日  "+d[today.getDay()]+"</font>";

document.getElementById('todayIs').innerHTML = hh;

}

</script>

</body>

3.显示页面停留时间

<body>

<div>当前页面停留时间：<span id="yy004" >0时0分0秒</span></div>

<script type="text/javascript">

var sec =0;

var minu=0;

var hou=0;

//每隔一秒刷新一次

window.setTimeout("uupdate()",1000);

function uupdate()

{

    sec++;

    if(sec==60)

    {

        sec =0;

        minu +=1;

    }

    if(minu==60)

    {

        minu=0;

        hou+=1;

    }

    var ss04 =hou+ "时"+minu+"分"+sec+"秒";

    document.getElementById('yy004').innerHTML=ss04;

    window.setTimeout("uupdate()",1000);

}

</script>

</body>

4.倒计时

<body>

<div id="yy005"></div>

<script type="application/javascript">

var nowDay = new Date();

var yyear = nowDay.getFullYear()+1;

var timeDate = new Date(yyear+"-01-01");

var date = timeDate.getTime()-nowDay.getTime();//获取剩余时间

//将剩余时间转换为剩余天数

var time = Math.floor(date/(1000*60*60*24));

var show005="";

if(time>=0)

{

    show005 = "现在离"+yyear+"年元旦还有：<font color='red'><b>"+time+"</b></font>天";

    document.getElementById('yy005').innerHTML=show005;

}

</script>

</body>

来源：《HTML、CSS、Javascript网页制作从入门到精通》15.1章节

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