实现发送短信验证码后60秒倒计时

nbsp;html>


<script></script><script> 
var countdown=60; 
function settime(obj) { 
    if (countdown == 0) { 
        obj.removeAttribute("disabled");    
        obj.value="免费获取验证码"; 
        countdown = 60; 
        return;
    } else { 
        obj.setAttribute("disabled", true); 
        obj.value="重新发送(" + countdown + ")"; 
        countdown--; 
    } 
setTimeout(function() { 
    settime(obj) }
    ,1000) 
}
 
</script> 
<input>