直接上代码:
<input type="button" id="btn" value="免费获取验证码" onclick="settime(this)" /> <script type="text/JavaScript"> var countdown=60; function settime(val) { if (countdown == 0) { val.removeAttribute("disabled"); val.value="免费获取验证码"; countdown = 60; } else { val.setAttribute("disabled", true); val.value="重新发送(" + countdown + ")"; countdown--; } setTimeout(function() { settime(val) },1000) } </script>