js短信验证倒计时
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
*{
margin: 0;
padding: 0;
}
button{
width: 100px;
}
</style>
<script type="text/javascript">
window.onload = function(){
var btn = document.getElementById('btn');
btn.onclick = function(){
this.disabled = true;
var count = 5;
var timer = null;
timer = setInterval(send,1000);
function send(){
count--;
if(count>=0){
btn.innerHTML = '还剩'+count+'s';
}
else{
btn.disabled = false;
btn.innerHTML = '重新发送短信';
clearInterval(timer);
count=5;
}
}
}
}
</script>
</head>
<body>
<input type="text" /><button id="btn">发送短信验证</button>
</body>
</html>
