互联学术JavaScript实现验证码倒计时的方法：首先创建一个HTML示例文件；然后创建一个button；最后通过“$('.hmac').on('click',function(){…}”方法获取验证码并实现倒计时60秒即可。
JavaScript怎么实现验证码倒计时？
js获取验证码倒计时60s(超简单)
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>测试jquey的ajax方法</title>
<style>
*{
padding:0;
margin:0;
}
button{width: 20%;line-height: 50px;font-size: 30px;margin-left: 40%;margin-top: 20%; }
</style>
</head>
<body>
<div id="test"></div>
<button>获取验证码</button>
<script type="text/javascript" src="jquery-1.8.2.min.js"></script>
<script>
$('.hmac').on('click',function(){
var that = $(this)
var timeo = 60;
var timeStop = setInterval(function(){
timeo--;
if (timeo>0) {
that.text('重新发送' + timeo +'s');
that.attr('disabled','disabled');//禁止点击
}else{
timeo = 60;//当减到0时赋值为60
that.text('获取验证码');
clearInterval(timeStop);//清除定时器
that.removeAttr('disabled');//移除属性，可点击
}
},1000)
})
</script>
</body>
</html>
