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秒杀

<script>
    $(function () {
        countDown();
    });

    function countDown() {
        var remainSeconds = $("#remainSeconds").val();
        var timeout;
        if (remainSeconds > 0) {//秒杀还没开始，倒计时
            $("#buyButton").attr("disabled", true);
            timeout = setTimeout(function () {
                $("#countDown").text(remainSeconds - 1);
                $("#remainSeconds").val(remainSeconds - 1);
                countDown();
            }, 1000);
        } else if (remainSeconds == 0) {//秒杀进行中
            $("#buyButton").attr("disabled", false);
            if (timeout) {
                clearTimeout(timeout);
            }
            $("#miaoshaTip").html("秒杀进行中");
        } else {//秒杀已经结束
            $("#buyButton").attr("disabled", true);
            $("#miaoshaTip").html("秒杀已经结束");
        }
    }