小编gri*_*quo的帖子

$(document).ready(function() {
	    updateClock();
	    var timeInterval = setInterval(updateClock(), 1000);
    });

    var ms = 1500000;
    var minutes = Math.floor(ms / 1000 / 60);
    var seconds = Math.floor((ms / 1000) % 60);

    function updateClock() {
	    ms -= 1000;
	    if (ms <= 0) {
		    clearInterval(timeInterval);
	    };
	    $('#minutes').html(minutes);
	    $('#seconds').html(seconds);
    }

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="minutes"></div>
	<div id="seconds"></div>