1-1时间器的算法

 <script>
        var date = new Date();
        //年月日
        console.log(date)
        var year = date.getFullYear();
        console.log(year)
        //月份从0开始
        var month = date.getMonth()+1;
        console.log(month)
        var data = date.getDate();
        console.log(data)

时间表

p>14:14:10</p>
    <script>
        var d= new Date();
        var hours = d.getHours();
        var minutes = d.getMinutes();
        var seconds = d.getSeconds();
        console.log(hours)
        console.log(minutes)
        console.log(seconds)
    </script>

当前时间在html页面上

 <div id="app"></div>
  <!-- 当前时间页面 -->
    <script>
    setInterval(show,1000)
    function show(){
        var app = document.getElementById("app")
        var d = new Date();
        var hours = d.getHours();
        var minutes = d.getMinutes();
        var seconds = d.getSeconds();
        var sum = handleNum(hours)+":"+handleNum(minutes)+":"+handleNum(seconds);
        console.log(sum)
        app.innerHTML = sum
        function handleNum(num){
            if(num<10){
                num = "0"+num;
                setTimeout.d
            }
            return num;
        }
    }
    </script>

算时间

 <script>
        var time = "2021-10-13  17:10:10"
        /*
        多少个小时，多少分钟，多少秒
        1获取当前时间的毫秒数
        */
       var d = new Date();
       //console.log(d.getTime())
       //2获取活动开始时间的毫秒数
       var startTime = d.getTime
       var endTime = new Date(time).getTime();
       //console.log(endTime)
       //3得到中间间隔的毫秒数
       var gapTime = endTime-startTime;
       //console.log(gapTime)
       var seconds = Math.floor(gapTime/1000);
       console.log(seconds)
       var hours = Math.floor(seconds/3600);
       console.log(hours)
       seconds = seconds -3600*hours;
       var minutes = Math.floor(seconds/60);
       console.log(minutes)
       seconds = seconds-minutes*60;
       console.log(seconds)
    </script>

 <script>
        var time = "2021-10-13  17:10:10"
        /*
        多少个小时，多少分钟，多少秒
        1获取当前时间的毫秒数
        */
       var d = new Date();
       //console.log(d.getTime())
       //2获取活动开始时间的毫秒数
       var startTime = d.getTime
       var endTime = new Date(time).getTime();
       //console.log(endTime)
       //3得到中间间隔的毫秒数
       var gapTime = endTime-startTime;
       //console.log(gapTime)
       var seconds = Math.floor(gapTime/1000);
       console.log(seconds)
       var hours = Math.floor(seconds/3600);
       console.log(hours)
       seconds = seconds -3600*hours;
       var minutes = Math.floor(seconds/60);
       console.log(minutes)
       seconds = seconds-minutes*60;
       console.log(seconds)
    </script>

 <script>
        var time = 306000;
        //3000毫秒
        var seconds = time/1000;
        console.log(seconds+"秒")
        var seconds = seconds-minutes*60
        //几分钟
        var minutes =Math.floor(seconds/60);
        console.log(minutes+"分")
        //3s
        console.log(seconds+"余下的秒")

 <script>
        var time = 306050000;
        /*
        3000
        1m =60s
        1h = 60*60s
        */
        var seconds = time/1000;
        console.log(seconds+"秒")
        var hours =Math.floor(seconds/3600);
        console.log(hours+"小时")
       var seconds = seconds%3600;
       console.log(seconds)
       var minutes  =Math.floor(seconds/60);
       console.log(minutes)
       seconds =seconds%60;
       console.log(seconds)
    </script>

 <script>
           var time = "2021-10-13 21:30:00" 
           var d = new Date();
           //console.log(d.getTime())
           var startTime = d.getTime();
           //获取活动开始时间的毫秒数
           var endTime = new Date(time).getTime();
           //console.log(endTime)
           //3 得到中间间隔的毫秒数
           var gapTime = endTime -startTime;
           var seconds = Math.floor(gapTime/1000)
           console.log(seconds+"秒")
           var hours = Math.floor(seconds/3600);
           console.log(hours)
           seconds = seconds - 3600*hours;
           var minutes = Math.floor(seconds/60);
           console.log(minutes)
           seconds = seconds -minutes*60;
           console.log(seconds)
    </script>

 <script>
        var time = "2021-10-19 08:30:00"
        var startTime = (new Date()).getTime();
        //console.log(startTime)
        var endTime = (new Date(time)).getTime();
        var gapTime = endTime-startTime;
        //console.log(gapTime/1000/60)
        var minutes =Math.floor(gapTime/(1000*60));
        //console.log(minutes)
        /*
        8201分
        1h =60m
        1t = 60*24
        */
        var days =Math.floor(minutes/(60*24));
        minutes = minutes -days*(60*24)
        console.log(days)
        var hours = Math.floor(minutes/60)
        console.log(hours)
        minutes = minutes-hours*60;
        console.log(minutes)
    </script>