js倒计时demo 天/时/分/秒 

<html>
<head>
    <meta charset="UTF-8">
    <title>js简单时分秒倒计时</title>
</head>
<body onload="countTime()">
<div>
    <span id="_d">00</span>
    <span id="_h">00</span>
    <span id="_m">00</span>
    <span id="_s">00</span>
</div>
<script type="text/javascript">
    function countTime() {
        //获取当前时间
        var date = new Date();
        var now = date.getTime();
        //设置截止时间
        var str="2030/8/21 18:00:00";
        var endDate = new Date(str);
        var end = endDate.getTime();

        //时间差
        var leftTime = end-now;
        //定义变量 d,h,m,s保存倒计时的时间
        var d,h,m,s;
        if (leftTime>=0) {
            d = Math.floor(leftTime/1000/60/60/24);
            h = Math.floor(leftTime/1000/60/60%24);
            m = Math.floor(leftTime/1000/60%60);
            s = Math.floor(leftTime/1000%60);
        }
        //将倒计时赋值到div中
        document.getElementById("_d").innerHTML = d+"天";
        document.getElementById("_h").innerHTML = h+"时";
        document.getElementById("_m").innerHTML = m+"分";
        document.getElementById("_s").innerHTML = s+"秒";
        //递归每秒调用countTime方法，显示动态时间效果
        setTimeout(countTime,1000);
    }
</script>
</body>
</html>

posted on 2018-08-21 16:06  DFrain  阅读(320)  评论(0)  编辑  收藏  举报

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