<!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>原生js60s倒计时</title>
<style>
</style>
</head>
<body>
<input type="button" id="btn" value="免费获取验证码" />
<script type="text/javascript">
//发送验证码按钮的60s倒计时
var countdown = 60;
var mfbtn=document.getElementById('btn');
var mfbtn=document.getElementById('btn');
mfbtn.style.background='#0af';
mfbtn.style.border='none';
mfbtn.style.borderRadius='5px';
mfbtn.style.height='30px';
mfbtn.style.color='#fff';
function settime(obj) {
if (countdown == 0) {
obj.disabled=false;
obj.value="免费获取验证码";
countdown = 60;
return;
} else {
obj.disabled=true
obj.value="重新发送" + countdown
countdown--;
mfbtn.style.background='#999';
}
setTimeout(function() {
settime(obj);
}, 1000)
};
mfbtn.onclick=function () {
settime(mfbtn);
};
</script>
</body>
</html>