HTML
<div class="getbox">
                    <span class="navt" tip="手机验证码"> <span>手机验证码</span>：</span> 
                    <input class="getphone nokong" type="text" name="yzm" id="yzm" value=""  placeholder="请输入验证码"/>
                    <input type="hidden" name="openid_start" value="{$openid_start}"/>
                    <input type="hidden" name="id" value="{$id}"/>
                     <input id="jingdu" name="jingdu"  type="hidden" >
                <input id="weidu" name="weidu"  type="hidden" >
                <input id="dizhi" name="dizhi" type="hidden"   value=""/>
                    <button type="button" class="getbtn" style="outline: none;background: #fff;border: 0;border-left: 1px solid#999;">
                        获取验证码
                    </button>
                </div>
            </div>

JS
<script type="text/javascript">
            $(".getbtn").on('click', function(){
                
                    var tel = $(".getphone").val();
                    if(!(/^1(3|4|5|7|8)\d{9}$/.test(tel))){ 
                        tip("手机号输入有误！请重新输入");
                        return; 
                    }
                    else{
                            var bb=$("#phone").val();
                     $.get("__URL__/regist", {iphone: bb},
                  function (text) {
                 
                   codetime(60);
                   
                   
                  });
                    /*codetime(60);*/
                    }
                })
            function codetime(wait){
                var _this=$(".getbtn");
                if (wait == 0) {
                    _this.attr("disabled", false);
                    _this.html("发送验证码");
                    _this.css('background-color','#428bca');
                }else{
//                    _this.css('background-color','#ccc');
                    _this.attr("disabled", true);
                    _this.html("重新发送(" + wait + ")");
                       wait--;
                       setTimeout(function() {
                           codetime(wait);
                       },1000)
                }
            }
            $(".getsubmit").click(function(){
if(choose()==false){
                    return;
                }
var bb=$("#yzm").val();
                 $.get("__URL__/yzm_do", {yzm: bb},
                  function (text) {
                 if(text=="no"){
                 tip("验证码输入错误");
                     return;
                 }else{
$("form").submit();
                 }
                  });
            /*    $("form").submit();    */
            })
</script>

后台代码

//后台方法
public function yzm_do(){
     $yzm=I("yzm");
    $yz=$_SESSION['yzm'];
    if($yzm == $yz){
      echo 'yes';
    }else{
      echo 'no';
    }
     
  }
public function regist(){
     $iphone=trim(I("iphone"));
     //$where['phone']=$iphone;
     //$fg=M("Adminuser")->where($where)->find();
     //$er=count($fg);
    $yz=getsyz(6);//验证码
    $_SESSION['yzm']=$yz;
     $post_data = array();
         $post_data['userid'] = 30;
$post_data['account'] = 'ymt';//账号
$post_data['password'] = 'ymt@2018';//密码
$post_data['content'] = '【易码通】你的验证码是'.$yz; //短信内容
$post_data['mobile'] =   $iphone;
$post_data['sendtime'] = ''; //时定时发送，输入格式YYYY-MM-DD HH:mm:ss的日期值
$url='http://39.108.71.168:8088/sms.aspx?action=send';
$o='';
foreach ($post_data as $k=>$v)
{
   $o.="$k=".urlencode($v).'&';
}
$post_data=substr($o,0,-1);
$ch = curl_init();
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
//curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); //如果需要将结果直接返回到变量里，那加上这句。
$result = curl_exec($ch);
     
     echo "";

   }