jQuery实现倒计时功能

定义和用法

    setInterval() 方法可按照指定的周期(以毫秒计)来调用函数或计算表达式。

    setInterval() 方法会不停地调用函数,直到 clearInterval() 被调用或窗口被关闭。由 setInterval() 返回的 ID 值可用作 clearInterval() 方法的参数。


下面举例
<html>
    <head>
        <meta charset="utf-8">
        <title>jquery简单倒计时</title>
        </style>
        <script type="text/javascript" src="js/jquery.min.js"></script>
        <script type="text/javascript">
 
            var intDiff = parseInt(60);//倒计时总秒数量
 
            function timer(intDiff) {
                window.setInterval(function() {
                    var day = 0,
                            hour = 0,
                            minute = 0,
                            second = 0;//时间默认值        
                    if (intDiff > 0) {
                        day = Math.floor(intDiff / (60 * 60 * 24));
                        hour = Math.floor(intDiff / (60 * 60)) - (day * 24);
                        minute = Math.floor(intDiff / 60) - (day * 24 * 60) - (hour * 60);
                        second = Math.floor(intDiff) - (day * 24 * 60 * 60) - (hour * 60 * 60) - (minute * 60);
                    }
                    if (minute <= 9)
                        minute = '0' + minute;
                    if (second <= 9)
                        second = '0' + second;
                    $('#day_show').html(day + "天");
                    $('#hour_show').html('<s id="h"></s>' + hour + '时');
                    $('#minute_show').html('<s></s>' + minute + '分');
                    $('#second_show').html('<s></s>' + second + '秒');
                    intDiff--;
                }, 1000);
            }
 
            $(function() {
                timer(intDiff);
            });
        </script>
    </head>
    <body>
        <h1>网页上的倒计时</h1>
        <div class="time-item">
            <span id="day_show">0天</span>
            <strong id="hour_show">0时</strong>
            <strong id="minute_show">0分</strong>
            <strong id="second_show">0秒</strong>
        </div>
        <!--倒计时模块-->
    </body>
</html>

代码技巧