js 倒计时点击和当前时间

<input id="btn" type="submit" value="确定" disabled="disabled" />

<span id="daojishi">10</span>

<script type="text/javascript">

window.setTimeout("YanChi()",1000);

function YanChi()

{

    var span = document.getElementById("daojishi");

    //改变span里面的值

    span.innerText = span.innerText-1;

    //判断是否减到了0

    if(span.innerText == 0)

    {

        document.getElementById("btn").removeAttribute("disabled");

        return;

    }

    window.setTimeout("YanChi()",1000);

}

</script>

倒计时

<div>

    <span id="h"></span>

    <span id="m"></span>

    <span id="s"></span>

</div>

<script type="text/javascript">

window.setInterval("Bian()",1000);

function Bian()

{

    var sj = new Date();

        document.getElementById("h").innerText = sj.getHours();

    document.getElementById("m").innerText = sj.getMinutes();

    document.getElementById("s").innerText = sj.getSeconds();

}

</script>

时间