SOURCE

$(function() {
    $('#btn').click(function() {
        var count = 10;
        var countdown = setInterval(CountDown, 1000);
        function CountDown() {
            $("#btn").attr("disabled", true);
            $("#btn").val("Please wait " + count + " seconds!");
            if (count == 0) {
                $("#btn").val("点击我").removeAttr("disabled");
                clearInterval(countdown);
            }
            count--;
        }
    })
});

<input type="button" id="btn" value="点击我" />
<script src="http://libs.baidu.com/jquery/1.11.3/jquery.min.js"></script>