<!DOCTYPE html> <html> <body> <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> </body> </html>
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