验证码计时器

前台html

<div class="register_img">  
 <div class="registerbox">   
                <div class="register">
  <div class="register_header">
  <span class="fl" style="font-size:18px;">沈阳市中小微企业科技服务平台|忘记密码</span>
  <span class="fr" style="font-size:14px;">返回登录页面，请<a style="color:#168AD5;" href="/login.jspx">登录</a></span>
  </div>
  <div class="register_content">
      <div class="register_id"><span>手机号：</span><input type="text" id="Smsmobile" name="Smsmobile"></input></div>
  <br/>
  <div class="register_pass"">
  <span>验证码：</span>
  <input type="text" value="6位数字验证码" onfocus="javascript:if(this.value=='6位数字验证码')this.value='';" id="ptSms" name="password"></input>
  <div style="display:inline;cursor: pointer;" id="sendSms" ><span class="register_login" id="ssendSms" style="text-align: center;" onclick="sendResetVerifyCode()">获取验证码</span></div>
  </div>
  <div style="text-align:center;cursor: pointer;" onclick="checkSmsfrominput()" ><span class="register_login">下一步</span></div>
  </div>
</div>
<input id="checkSms" type=hidden>
      </div>  
 </div>

JS代码

var countdown=3, interval;
var clickFlag = false;
var mobile=$("#Smsmobile").val();
function sendResetVerifyCode() {
if(clickFlag)
return ;
clickFlag = true;
interval = setInterval("timer()", 1000);


$.get("sendResetVerifyCode.jspx", {
mobile : mobile
}, function(result){
//在控制台输出
//console.log(result);
if(result.success){
alert("发送成功");
$("#checkSms").val(result.code);
}else{
alert("发送失败");
}

});
}
function timer() {
if (countdown == 0) {
$("#ssendSms").text("获取验证码");
$("#ssendSms").attr("style","text-align: center;");
$("#ssendSms").attr("class","register_login");
countdown = 3;
clickFlag= false;
clearInterval(interval);
return;
} else {
$("#ssendSms").text("重新发送(" + countdown + ")");
$("#ssendSms").attr("style","background-color:#D3D3D3;text-align: center;");
countdown--; 
}
}
function checkSmsfrominput(){
var checkSms=$("#checkSms").val();
var putSms=$("#ptSms").val();
if(checkSms!=""&&checkSms==putSms){
location.href ="rePassword.jspx";
}else{
alert("验证码输入错误");
}
}