<a href="javascript:void(0);" onclick="get_captcha()" class="btn btn-default btn6" id="for_captcha" >获取验证码</a>

 <script type="text/javascript">

 var url="/get-verify-code?phone_number=";

 var i;

 function count_down(){

       i=i-1;

       $('#for_captcha').attr('disabled','disabled');

       $('#for_captcha').html('剩余'+i+'秒..');

       if(i<=0){

       $('#for_captcha').removeAttr('disabled','disabled');

       $('#for_captcha').html('获取验证码');

                 window.clearTimeout(countdown);

        }

        else{

                 var countdown=setTimeout('count_down()',1000);

        }

 }

 function get_captcha(){

     var phone= $('#phone').val();//console.log(phone);

     url=url+phone;              

      re= /^1\d{10}$/;

      if (re.test(phone)) {

              $.post(url,function(data){

                     console.log(date);

              }).complete(function(){

                     console.log('complete');

              });

              i=60;

              count_down();

       }

       else {

              alert("手机号码不正确");

              return false;

       }

  }

 </script>

var btn_el = $(this);

var wait = ;

btn_el.css('background-color','#aaa');

btn_el.text('再次获取'+wait+'...');

btn_el.prop('disabled',true);

var temp = setInterval(function(){

    wait--;

    btn_el.text('再次获取'+wait+'...');

    if(wait == ){

        window.clearInterval(temp);

        btn_el.css('background-color','#f14658');

        btn_el.text('获取验证码');

        btn_el.prop('disabled',false);

    }

}, );