短信验证码倒计时

时间：2021-11-04 22:02:24
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>
<script type="text/javascript"> 
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>
<body> 
<input type="button" id="btn" value="免费获取验证码" onclick="settime(this)" /> 

</body>
</html>

 

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