很不错的js60秒倒计时

js代码

var countdown=60;

function settime(val) {

if (countdown == 1) {

val.removeAttribute("disabled");

val.value="免费获取验证码";

countdown = 60;

clearInterval(intervalid);

} else {

val.setAttribute("disabled", true);

val.value="重新发送(" + countdown + ")";

countdown--;

}

setTimeout(function() {

settime(val)

},1000)

}

html标签：

<input type="button" style="height: 50px;width: 100px;" value="获取短信验证码" id="yanzhengmaID" onclick="settime(this)"><br/>