jQuery发送验证码60秒倒计时

<!DOCTYPE html>
<html>
<head>

 <meta  http-equiv="content-type" content="text/html; charset=UTF-8">
 <meta content="width=device-width,initial-scale=1.0,maximum-scale=1.0,user-scalable=no" id="viewport" name="viewport">
 <title></title>
<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>

文章转载自：http://www.cnblogs.com/flyqingfei/p/jQuery.html

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原文地址：https://www.cnblogs.com/liyuhuan/p/6118055.html