<!DOCTYPE html>
<html lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>js实现倒计时60秒的简单代码(推荐)</title>
</head>
 
<body>
<input type="button" id="btn" value="获取验证码" onclick="settime(this)" />
<script type="text/javascript">
  // countdown 最好是后台传过来的值 var countdown=60; function settime(val) { if (countdown == 0) { val.removeAttribute("disabled");
       // 两种方法都可以 
       // val.disabled = false val.value
="获取验证码"; countdown = 60; } else { val.setAttribute("disabled", true);
       // 两种方法都可以
       // val.disabled = true val.value
=countdown + "秒后重新发送"; countdown--; setTimeout(function() { settime(val) },1000) } } </script> </body> </html>