<!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 + "s)"; 
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>

 

给心灵一个纯净空间，让思想，情感，飞扬！