简易js网页实时时钟日历

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<script language="javascript">
function timeF(i){
    if(i<10){
        i="0"+i;
    }
    return i;
}
function showtime()
{
var today,hour,second,minute,year,month,date;
var strDate ;
today=new Date();
var n_day = today.getDay();
switch (n_day)
{
    case 0:{
      strDate = "星期日"
    }break;
    case 1:{
      strDate = "星期一"
    }break;
    case 2:{
      strDate ="星期二"
    }break;
    case 3:{
      strDate = "星期三"
    }break;
    case 4:{
      strDate = "星期四"
    }break;
    case 5:{
      strDate = "星期五"
    }break;
    case 6:{
      strDate = "星期六"
    }break;
    case 7:{
      strDate = "星期日"
    }break;
}
year = today.getFullYear();
month = today.getMonth()+1;
date = today.getDate();
hour = today.getHours();
minute =today.getMinutes();
second = today.getSeconds();
document.getElementById('time').innerHTML = year + "年" + month + "月" + date + "日  " + strDate +"  " + timeF(hour) + ":" + timeF(minute) + ":" + timeF(second); //显示时间
setTimeout("showtime();", 1000); //设定函数自动执行时间为 1000 ms(1 s)
}
</script>

<span id="time"></span><script language="javascript"> showtime();</script>