js 发送短信验证码倒计时

html

<input type="button" id="btn" value="免费获取验证码" onclick="settime(this)" />

js

// 短信验证码倒计时
var countdown=60;
function settime(obj) {
 ???if (countdown == 0) {
 ???????obj.removeAttribute("disabled");
 ???????obj.value="免费获取验证码";
 ???????countdown = 60;
 ???????return;
 ???} else {
 ???????obj.setAttribute("disabled", true);
 ???????obj.value="重新发送(" + countdown + ")";
 ???????countdown--;
 ???}
 ???setTimeout(function() {
 ???????????settime(obj) }
 ???????,1000)
}

js 发送短信验证码倒计时

原文地址：https://www.cnblogs.com/shuihanxiao/p/9813144.html