如果您可以接受轻量级代码,即不使用 jQuery 倒数计时器,以下内容可能会对您有所帮助:
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script type="text/javascript" src="http://localhost/web/JavaScript/jQuery/jquery"></script>
<script type="text/javascript">
    var countUpSeconds = 0;
    var interval = null;
    function displayTime() {
          $("#timeContainer").text(format(Math.floor(countUpSeconds/60))+":"+format(countUpSeconds%60));
    }
    function playStop() {
        if(interval) {interval=window.clearInterval(interval);}
        else {interval = window.setInterval(countUp, 1000);}
    }
    function countUp() {
        ++countUpSeconds;
        if(countUpSeconds >= 3600) {/* do something when countup is reached*/}
        displayTime();
    }
    function format(s) {return s<10 ? "0"+s : s;}
    $(function() {
        displayTime();
        $("#playStop").on("click", function () { playStop(); } );
        $("#addMin").on("click", function () { countUpSeconds += 60; displayTime(); } );
        $("#subMin").on("click", function () { countUpSeconds = Math.max(0, countUpSeconds-60); displayTime(); } );
        $("#addSec").on("click", function () { countUpSeconds += 1; displayTime(); } );
        $("#subSec").on("click", function () { countUpSeconds = Math.max(0, countUpSeconds-1); displayTime(); } );
    });
</script>
</head>
<body>
<div id="timeContainer"></div>
<button id="playStop">Play/Stop</button>
<button id="addMin">+1 minute</button>
<button id="subMin">-1 minute</button>
<button id="addSec">+1 second</button>
<button id="subSec">-1 second</button>
</body>
</html>