本文实例讲述了js与jQuery实现的用户注册协议倒计时功能。分享给大家供大家参考，具体如下：
方法一：
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>www.jb51.net 注册倒计时</title>
<script type="text/javascript">
//用户有十秒钟的时间看协议，超过十秒钟，“同意”按钮将生效
var Seconds = 10;
//计时器ID
var setIntervalID;
function ok() {
var getid = document.getElementById("but");
if (Seconds <= 0) {
getid.value="同意";
getid.disabled = false; //或者写成getid.disabled=""; 启用getid控件。
//停止计时器
clearInterval(setIntervalID);
}
else {
getid.value = "请仔细阅读协议还剩下【" + Seconds + "】秒";
}
Seconds--;
}
setIntervalID=setInterval("ok()", 1000);
</script>
</head>
<body>
<textarea cols="20" rows="8"></textarea><br />
<!--disabled="disabled" 默认submit表单是禁用的，也就是只读的，不能点击-->
<input type="submit" id ="but" value="同意" disabled="disabled" />
</body>
</html>
运行效果：
方法二：
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>www.jb51.net 注册倒计时</title>
<script src="jquery-1.7.2.min.js"></script>
</head>
<body>
<form action="//www.jb51.net/" method="post" name="agree">
<input type="submit" class="button" value="" name="agreeb">
</form>
</body>
</html>
<script>
var secs = 5;
var si;
$(function () {
$(".button").attr("disabled", "disabled");
$(".button").val("请认真查看<服务条款和声明>(" + secs + ")")
si = setInterval(a, 1000);
})
function a() {
$(".button").val("请认真查看<服务条款和声明>(" + (secs-1) + ")");
if (secs == 0) {
clearInterval(si);
$(".button").val("我同意" ).removeAttr("disabled");
}
secs--;
}
</script>
运行效果：
方法三：
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>www.jb51.net 注册倒计时</title>
</head>
<body>
<form action="//www.jb51.net/" method="post" name="agree">
<input type="submit" class="button" value="请认真查看<服务条款和声明> (30)" name="agreeb">
</form>
</body>
</html>
<script>
var secs = 30;
document.agree.agreeb.disabled = true;
for (var i = 1; i <= secs; i++) {
window.setTimeout("update(" + i + ")", i * 1000);
}
function update(num) {
if (num == secs) {
document.agree.agreeb.value = " 我 同 意 ";
document.agree.agreeb.disabled = false;
}
else {
var printnr = secs - num;
document.agree.agreeb.value = "请认真查看<服务条款和声明> (" + printnr + ")";
}
}
</script>
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