本文实例为大家分享了js周期性获取短信验证码的具体代码，供大家参考，具体内容如下
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
<input type="text"/>
<input type="button" id="btn" value="点击发送验证码"/>
<script>
var timerId = null;
var btn = document.getElementById("btn");
var num = 5;
btn.onclick = function () {
btn.disabled = true;
timerId = setInterval(function () {
num--;
btn.value = num + "秒后可以发送";
if (num === 0) {
clearInterval(timerId);
btn.value = "点击发送验证码";
btn.disabled = false;
num = 5;
}
}, 1000);
};
</script>
</body>
</html>
