jQuery - 150分钟倒计时 -

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <link rel="stylesheet" href="https://cdn.bootcss.com/amazeui/2.7.0/css/amazeui.min.css">
    <style media="screen">
        i.icon {
            float: left;
            width: 36px;
            height: 36px;
            line-height: 32px;
            vertical-align: middle;
            text-align: center;
            border-radius: 50%;
            border: 2px solid #2a75ed;
            color: #2a75ed;
            box-sizing: border-box;
        }
    </style>
</head>

<body>
    <div class="time"></div>
    <i class="icon am-icon-pause"></i>
    <script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script>
    <!-- 倒计时 -->
    <script type="text/javascript">
        var Time = 9000;
        var int = null;
        var $time = $('.time');

        function timer() {
            Time--;
            if (Time == 0) {
                alert('时间到')
            }

            int = setTimeout(timer, 1000);

            var minutes = parseInt((Time / 60)); // 分
            var seconds = parseInt((Time % 60)); // 秒

            function checkTime(i) { //将0-9的数字前面加上0\.  1变为01
                if (i < 10) {
                    return '0' + i;
                } else {
                    return i;
                }
            }

            minutes = checkTime(minutes);
            seconds = checkTime(seconds);

            $time.html(minutes + ':' + seconds);
        }
        timer();

        // 点击事件 开启、暂停时间
        var $icon = $('i.icon');

        $icon.on('click', function() {

            if ($(this).hasClass('am-icon-pause')) {
                $(this).removeClass('am-icon-pause').addClass('am-icon-play');
                // 点击图标暂停
                clearInterval(int);

            } else {
                $(this).addClass('am-icon-pause');
                // 点击图标开启
                timer();
            }
        })
    </script>
</body>

</html>