js或jquery对日期的操作 

获取今天星期几
<script language="javascript">
var now=new Date();            //获取系统日期
var day=now.getDay();        //获取星期
var week;
switch (day){
    case 1:
        week="星期一";
        break;
    case 2:
        week="星期二";
        break;
    case 3:
        week="星期三";
        break;
    case 4:
        week="星期四";
        break;
    case 5:
        week="星期五";
        break;
    case 6:
        week="星期六";
        break;
    default:
        week="星期日";
       break;
}
document.write("今天是"+week);    //输出中文的星期
</script>

 

实时显示系统时间
<script language="javascript">
    function realSysTime(clock){
        var now=new Date();            //创建Date对象
        var year=now.getFullYear();    //获取年份
        var month=now.getMonth();    //获取月份
        var date=now.getDate();        //获取日期
        var day=now.getDay();        //获取星期
        var hour=now.getHours();    //获取小时
        var minu=now.getMinutes();    //获取分钟
        var sec=now.getSeconds();    //获取秒钟
        month=month+1;
        var arr_week=new Array("星期日","星期一","星期二","星期三","星期四","星期五","星期六");
        var week=arr_week[day];        //获取中文的星期
        var time=year+"年"+month+"月"+date+"日 "+week+" "+hour+":"+minu+":"+sec;    //组合系统时间
        clock.innerHTML="当前时间："+time;    //显示系统时间
    }
    window.onload=function(){
        window.setInterval("realSysTime(clock)",1000);    //实时获取并显示系统时间
    }
    </script>

　　　<body>
　　　　<div id="clock"></div>
　　　</body>

 

倒计时获取
<body>
<div id="countDown"><b>——</b></div>
<script language="javascript">
window.onload=countdown("2020年国庆节","10/1/2020",countDown);

function countdown(title,Intime,divId){
var online= new Date(Intime);
var now = new Date();
var leave = online.getTime() - now.getTime();
var day = Math.floor(leave / (1000 * 60 * 60 * 24))+1;
if (day > 1){ 
         //if(document.all){
            divId.innerHTML="<b>——距"+ title+"还有"+day +"天！</b>";
        //}
}else{
     if (day == 1) {
         if(document.all){
            divId.innerHTML="<b>——明天就是"+title+"啦!</b>";
        }
         
    }else{
         if (day == 0) {divId.innerHTML="<b>今天就是"+title+"呀！</b>";
         }else{
             if(document.all){
                divId.innerHTML="<b>——唉呀！"+title+"已经过了！</b>";
             }
        }
    }
}
}
</script>
</body>

 

posted @ 2020-02-06 21:31  李重黎  阅读(275)  评论(0)    收藏  举报