一、例子

1、播放量

<script>
        var num = 101000000;
        if(num>100000000){
           num = num/100000000 + "亿" 
        }else if(num>=10000){
            num =  Math.ceil(num/10000)+"万"
        }
        console.log(num);
    </script>

<script>
        function handleNum(num){
             if (num > 100000000) {
                num = num / 100000000 + "亿"
            } else if (num >= 10000) {
                num = Math.ceil(num / 10000) + "万"
            }
            return num;
        }
        var res = handleNum(100000);
        console.log(res);
    </script>

<script>
        function handleNum(num){
            if(num>=100000000){
                num = num/100000000+"亿"
            }else if(num>=10000){
                num = num/10000+"万"
            }
            return num+"";
        }
        var arr = [
            {name:"你好",playcount:4000},
            {name:"它",playcount:400040},
            {name:"谁",playcount:20000000000}
        ]
        arr.forEach(item=>{
            item.playcount = handleNum(item.playcount);
        })
        console.log(arr)
    </script>

1.1、{name: ‘你好’, playCount: ‘4000’}

<script>
        function handleNum(num){
            if(num>=100000000){
                num = num/100000000+"亿"
            }else if(num>=10000){
                num = num/10000+"万"
            }
            return num+"";
        }
        var arr = [
            /* 4000 */
            {name:"你好",playCount:4000},
            /* 40万 */
            {name:"它",playCount:400040},
            /* 2亿 */
            {name:"谁",playCount:200000000}
        ]
        arr.forEach(item=>{
            item.playCount = handleNum(item.playCount);
        })
        console.log(arr)
    </script>

2、输入时间

<div id="app"></div>
    <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;
            }
            return num;
        }
    </script>

3、现在时间

<script>
        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)
        function  handleNum(num){
            if(num<10){
                num = "0"+num;
            }
            return num;
        }
    </script>

4、距离2021-10-13 17:10:10还剩多少时间

<script>
        var time = "2021-10-13 17:10:10"
        /* 多个小时,多分钟,多少秒 */;
        /* 1、获取当前时间的毫秒数 */
        var d = new Date();
        // console.log(d.getTime())
        var startTime = d.getTime();
        /* 2、获取活动开始时间的毫秒 */
        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)
        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)
        /* var time = "2021-10-13 21:30:00"  第一个需求*/
        /*  var  time ="2021-10-19 08:30:00" 还有几天几小时几分 */
    </script>

5、分秒时间的换算

<script>
        var time  = 360000;
        /*
        66s 
         */
        /* 
          一秒
        60s  一分钟       
       60*60 一小时
        time/1000  秒
         */
        var seconds = Math.floor(time/1000);
        console.log(seconds)
        var hours = Math.floor(seconds/3600);
        console.log(hours)
        // seconds = seconds- hours*3600;
        seconds = seconds%3600;
        console.log(seconds)
        var minutes = Math.floor(seconds/60);
        console.log(minutes)
        seconds = seconds- minutes*60;
        console.log(seconds)
    </script>

<script>
        var time = 306000;
        /* 3000 
        1m = 60s
        */
        var seconds = time/1000;
        console.log(seconds+"秒")
        var minutes = Math.floor(seconds/60);
        var seconds = seconds - minutes*60;
        console.log(minutes+"分")
        console.log(seconds+"余下的秒")
        /* 3s */
    </script>

<script>
        var time = 306150000;
        /* 3000 
        1m = 60s
        1h = 60*60s
        */
        var seconds = time/1000;
        console.log(seconds+"秒")
        var hours = Math.floor(seconds/3600);
        console.log(hours)
        var seconds = seconds%3600;
        console.log(seconds)
        var minutes= Math.floor(seconds/60);
        console.log(minutes)
        seconds = seconds%60;
        console.log(seconds)
        /* 3s */
    </script>

6、2021-10-19 08:30:00” 还有几天几小时几分

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