<div style="width:500px; height:500px; margin:100px 0px 0px 100px">
<input id="btn" type="submit" value="确定" style="width:100px; height:35px" disabled="disabled" />
<span id="daojishi">10</span>
<div style="margin-top:20px">
<span id="h"></span>
<span id="m"></span>
<span id="s"></span> </div>
</div>
<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);
}
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>