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

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<!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>