js原生倒计时

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一个倒计时的小Demo

<div id="tcltime"></div>

<script>    var tclTime = document.getElementById("tcltime");    setInterval(fn,1);    function fn(){        var tfutureTime = new Date("2017/11/20 00:00:00");        var tnowTime = new Date();        var tsumMS = tfutureTime.getTime() - tnowTime.getTime();        var tday = parseInt(tsumMS/1000/60/60/24);        var thour = parseInt(tsumMS/1000/60/60%24);        var tminute = parseInt(tsumMS/1000/60%60);        var tsecond = parseInt(tsumMS/1000%60);        if(tday<10){            tday = "0"+tday;        }        if(thour<10){            tthour = "0"+thour;        }        if(tminute<10){            tminute = "0"+tminute;        }        if(tsecond<10){            tsecond = "0"+tsecond;        }        tcltime.innerHTML = "距离活动还有："+tday+"天"+thour+"小时"+tminute+"分钟"+tsecond+"秒钟";    }</script>

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