js获取验证码倒计时
获取验证码倒计时
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>验证码的倒计时</title>
<style type="text/css">
*{ margin: 0; padding: 0}
#btn{
background: #fff;
border-radius: 10px;
text-align: center;
font-size: 18px;
font-weight: bold;
color: #fff;
margin: 100px auto;
height: 50px;
width: 150px;
color: #000;
}
#btn.set {
background: #666;
color: #fff;
}
</style>
</head>
<body>
<input type="button" id="btn" value="免费获取验证码" />
<script type="text/javascript">
var wait=30;
function time(o) {
if (wait == 0) {
o.removeAttribute("disabled");
o.className = "";
o.value="免费获取验证码";
wait = 30;
}
else {
if(wait<10){
o.value="重新发送(0"+wait+")";
wait--;
setTimeout(function() {
time(o)
},1000)
}
else{
o.setAttribute("disabled", true);
o.className = "set";
o.value="重新发送(" + wait + ")";
wait--;
setTimeout(function() {
time(o)
},1000)
}
}
}
document.getElementById("btn").onclick=function(){
time(this);
}
</script>
</body>
</html>
