方法一：jquery实现发送短信验证码后60秒倒计时
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<script src="js/jquery-3.2.1.min.js"></script>
<title>666</title>
</head>
<body>
<input type="button" id="btn" value="获取验证码"/>
<script>
$(function () {
$('#btn').click(function () {
var count = 60;
var countdown = setInterval(CountDown, 1000);
function CountDown() {
$("#btn").attr("disabled", true);
$("#btn").val("重新发送("+count +")");
if (count == 0) {
$("#btn").val("获取验证码").removeAttr("disabled");
clearInterval(countdown);
}
count--;
}
})
});
</script>
</body>
</html>