//倒计时 账户信息 手机绑定
function fun_timedown(time)
{
if(time=='undefined')
time = 60;
$("#timedown").html(time+"秒");
time = time-1;
if(time>=0)
{
setTimeout("fun_timedown("+time+")",1000);
}else
{
alert('倒计时结束!');
}
}
<input type='button' id='timedown' value='确定'/>