jquery实现倒计时60秒发送邮件

<script type="text/javascript">
var i = 120;
$('#btn').click(function(){
var url = "{{url('send')}}";
var email = $('#empty').val();
/* alert(email);
alert(url);*/
if (email=='') {
alert('请填写邮箱');
};
$.get(url,{'email':email},function(msg)
{
//alert(msg);
if (msg==0) {
function wait()
{
if (i > 0)
{
i--;
$('#btn').attr("disabled", true);
$('#btn').val("重新发送(" + i + ")");
}else{
$('#btn').attr("disabled");
$('#btn').val("免费获取验证码");
i= 120;
alert('验证码失效')
}
}
setInterval(wait, 1000);
}else{
alert('发送失败');
}
})
})

</script>

 <td>输入验证码:</td><td><input type="text" name="empty"><input type="button" id="btn" value="免费获取验证码" class="empty"/>

 <script type="text/javascript">

                var i = 120;

                $('#btn').click(function(){

                  var url = "{{url('send')}}";

                  var email = $('#empty').val();

                 /* alert(email);

                  alert(url);*/

                  if (email=='') {

                    alert('请填写邮箱');

                  };

                  $.get(url,{'email':email},function(msg)

                  {

                    //alert(msg);

                      if (msg==0) {

                          function wait()

                               {

                          if (i > 0)

                              {

                              i--;

                              $('#btn').attr("disabled", true);

                              $('#btn').val("重新发送(" + i + ")");

                              }else{

                                $('#btn').attr("disabled");

                                $('#btn').val("免费获取验证码");

                                i= 120;

                                alert('验证码失效')

                              }

                          }

                         setInterval(wait, 1000);

                      }else{

                           alert('发送失败');

                      }

                  })

                })

                

            </script>