javascript 计算倒计时

    function timeDown(second) {

        var month = '', day = '', hour = '', minute = '';

        if (second >= 86400 * 30) {

            month = Math.floor(second / (86400 * 30)) + '月';

            second = second % (86400 * 30);

        }

        if (second >= 86400) {

            day = Math.floor(second / 86400) + '天';

            second = second % (86400);

        }

        if (second >= 3600) {

            hour = Math.floor(second / 3600) + '小时';

            second = second % 3600;

        }

        if (second >= 60) {

            minute = Math.floor(second / 60) + '分';

            second = second % 60;

        }

        if (second > 0) {

            second = second ? second + '秒' : '';

        }

        return month + day + hour + minute + second;

    }

如果想显示倒计时效果,可以使用如下代码调用:

<!-- 引入jquery -->

<script>

    $(function () {

        var second = 10000;

        $('.remain_time').html(timeDown(second));

        setInterval(function () {

            second--;

            $('.remain_time').html(timeDown(second));

        }, 1000);

    })

</script>

<span class="remain_time"></span>

jquery插件形式:

            $.fn.timeDown = function (opt) {

                var second = opt.second;

                var tip = '已过期';

                var $this = this;

                self._timeDown = function (second) {

                    var month = '', day = '', hour = '', minute = '';

                    if (second >= 86400 * 30) {

                        month = Math.floor(second / (86400 * 30)) + '月';

                        second = second % (86400 * 30);

                    }

                    if (second >= 86400) {

                        day = Math.floor(second / 86400) + '天';

                        second = second % (86400);

                    }

                    if (second >= 3600) {

                        hour = Math.floor(second / 3600) + '小时';

                        second = second % 3600;

                    }

                    if (second >= 60) {

                        minute = Math.floor(second / 60) + '分';

                        second = second % 60;

                    }

                    if (second > 0) {

                        second = second ? second + '秒' : '';

                    } else {

                        return tip;

                    }

                    return month + day + hour + minute + second;

                };

                $this.html(self._timeDown(second));

                setInterval(function () {

                    second--;

                    $this.html(self._timeDown(second));

                }, 1000)

            };

// 使用方式

$('.remain_time').timeDown({second:1000,tip:'已过期'})