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js 倒计时毫秒级别显示

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12/02
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<html>

<head>

    <style>

        div{

            width:100%;

             text-align:center;

            font-size: 14px;

        }

    </style>

</head>

        <div id="go">

        </div>

<body>

    <script>

        var SECOND = 1000;

        var MINUTE = 60 * SECOND;

        var HOUR = 60 * MINUTE;

        var DAY = 24 * HOUR;

        var TIME = Date.now() + 100000;

        var lastTIME = Date.now();

        var prev = Date.now();

        function fallback(fn) {

            var curr = Date.now();

            var ms = Math.max(0, 16 - (curr - prev));

            var id = setTimeout(fn, ms);

            prev = curr + ms;

            return id;

        }

        var root = window;

        var iRaf = root.requestAnimationFrame || fallback;

        function raf(fn) {

           return iRaf.call(root, fn);

        } 

        function parseTimeData(time) {

            var days = Math.floor(time / DAY);

            var hours = Math.floor(time % DAY / HOUR);

            var minutes = Math.floor(time % HOUR / MINUTE);

            var seconds = Math.floor(time % MINUTE / SECOND);

            var milliseconds = Math.floor(time % SECOND);

            return {

                days,

                hours,

                minutes,

                seconds,

                milliseconds

            };

        }

        function MAXTime(){

            return Math.max(Date.now() - lastTIME,0)

        }

        function Calculation(){

            (0,raf)(function(){

                if(MAXTime()){

                    document.getElementById('go').innerHTML = JSON.stringify(parseTimeData(TIME - lastTIME))

                }

                lastTIME = Number(Date.now())

                Calculation()

            })

        }

        Calculation()

    </script>

</body>

</html>

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