jquery 实现 点击按钮后倒计时效果，多用于实现发送手机验证码、邮箱验证码
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script src="HTML/js/jquery-1.4.1.min.js" type="text/javascript"></script>
<script type="text/javascript">
/*-------------------------------------------*/
var InterValObj; //timer变量，控制时间
var count = 5; //间隔函数，1秒执行
var curCount;//当前剩余秒数
var code = ""; //验证码
var codeLength = 6;//验证码长度
function sendMessage() {
curCount = count;
var dealType; //验证方式
var uid=$("#uid").val();//用户uid
if ($("#phone").attr("checked") == true) {
dealType = "phone";
}
else {
dealType = "email";
}
//产生验证码
for (var i = 0; i < codeLength; i++) {
code += parseInt(Math.random() * 9).toString();
}
//设置button效果，开始计时
$("#btnSendCode").attr("disabled", "true");
$("#btnSendCode").val("请在" + curCount + "秒内输入验证码");
InterValObj = window.setInterval(SetRemainTime, 1000); //启动计时器，1秒执行一次
//向后台发送处理数据
$.ajax({
type: "POST", //用POST方式传输
dataType: "text", //数据格式:JSON
url: 'Login.ashx', //目标地址
data: "dealType=" + dealType +"&uid=" + uid + "&code=" + code,
error: function (XMLHttpRequest, textStatus, errorThrown) { },
success: function (msg){ }
});
}
//timer处理函数
function SetRemainTime() {
if (curCount == 0) {
window.clearInterval(InterValObj);//停止计时器
$("#btnSendCode").removeAttr("disabled");//启用按钮
$("#btnSendCode").val("重新发送验证码");
code = ""; //清除验证码。如果不清除，过时间后，输入收到的验证码依然有效
}
else {
curCount--;
$("#btnSendCode").val("请在" + curCount + "秒内输入验证码");
}
}
</script>
</head>
<body>
<input id="btnSendCode" type="button" value="发送验证码" onclick="sendMessage()" /></p>
</body>
</html>原文：
http://www.cnblogs.com/steed-zgf/archive/2012/02/03/2336984.html
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