html:

<div id="num">
    <input class="text-input" type="tel" name="telphone" placeholder="手机号码" onfocus='this.value=(this.value=="")?" ":this.value;'
           onblur='this.value=(this.value==" ")?"":this.value.replace(/(^\s*)|(\s*$)/g, "");'
    />
    <div class="yan" >发送验证码(60)</div>
</div>

<div id="code">
    <input class="text-input"  type="tel" name="code" placeholder="验证码" onfocus='this.value=(this.value=="")?" ":this.value;'
           onblur='this.value=(this.value==" ")?"":this.value.replace(/(^\s*)|(\s*$)/g, "");'/>
</div>

<div id="next">注册</div>
    <div id="xieyi">
        若是注册，则表示您已赞成<a href="javascript:void(0);" data-toggle="modal" data-target="#myModal">《用户协议书》</a>条款
    </div>

　　<!-- 模态框（Modal） -->

 </div>

jq:

//点击发送验证码
$(".yan").click(function(){
    var telphone = $("[name = 'telphone']").val();
    if(telphone == ""){
        alert("请填写手机号码");
        return false;
    }
    //判断该号码是否已被注册
    $.get(
            "/haslogin/"+telphone,function(data){
                if(data.status == 200){
                    alert("此号码已被注册！");
                    return false;
                }else{
                    var w = 60;
                    var dsq;
                    //发送验证码接口。
                    $.post(
                            "/mobsms/sendsms",
                            {phone:telphone},
                            function(data){
                                if(data.status == 467){
                                    alert("请求校验验证码频繁（5分钟校验超过3次）");
                                    return false;
                                }
                                if(data.status == 457){
                                    alert("手机格式错误");
                                    return false;
                                }
                                if(data.status == 478){
                                    alert("12小时内最多发送5条");
                                    return false;
                                }
                                else{
                                    dsq = setInterval(function(){
                                        w--;
                                        $(".yan").html("正在发送("+w+")");
                                        if(w == 0){
                                            w = 60;
                                            clearInterval(dsq);
                                            $(".yan").html("重发(60)");
                                        }
                                    },1000);
                                }
                            }
                    );
                }
            }
    );
});

$('#next').click(function()var telphone = $('[name = "telphone"]').val();

var nick = $('[name = "nikename"]').val();
var pwd = $('[name = "pwd"]').val();
var code = $('[name = "code"]').val();//验证码
    if(nick == ''){
        alert('请填写昵称!');
        return false;
    }
    if(telphone == ''){
        alert('请填写手机号码!');
        return false; }  //判断用户输入的验证码是否正确接口。    $.post(            "/mobsms/checkcode",            {phone:telphone,code:code},            function(data){                if(data.status != 200){                    alert("验证码错误或已失效");                    return false;                }            }    );    //注册接口    $.post(            '/users/signup',            {login:telphone,nickname:nick,password:pwd},function(data){                if(data.status == 200){                    alert('注册成功，立刻登陆吧！');                                 }            }        )}