<script src="http://code.jquery.com/jquery-latest.js"></script>
<input type="button" onclick="setclock($(this),10);"  value="获取验证码">
<script>
function setclock(dom,value,text)
{
    value=arguments[1]||60; 
    text=arguments[2]||"s后可重发验证码"; 

    dom.attr("disabled","disabled");    
    if(!dom.attr("data-clock"))
    {
        dom.attr("data-dvalue",dom.val());
        value--;
        dom.attr("data-clock",value);
        dom.val(value+text);
    }else
    {        
        var thisValue=parseInt(dom.attr("data-clock"))-1;
        dom.attr("data-clock",thisValue);
        dom.val(thisValue+text);
    }
    
    if(parseInt(dom.attr("data-clock"))>0)
    {
        setTimeout(function(){setclock(dom,value,text)},1000);
    }else
    {
        dom.removeAttr("disabled");
        dom.removeAttr("data-clock");        
        dom.val(dom.attr("data-dvalue"));
    }
}
</script>