发送短信验证码,js效果(找回密码)

<button type="button" class="btn-primary-disabled yzmm" onclick="send_sms(this)" >发送短信验证码</button>

 var countdown = 60;
                function aaa(){
                    if (countdown == 0) {
                        $('.yzmm').attr("disabled",false);
                        $('.yzmm').text("发送短信验证码");
                        // pointer-events: auto|none;
                        countdown = 60;
                        return false;
                    } else {
                        countdown--;
                        // console.log(countdown);
                        $('.yzmm').attr("disabled",true);
                        $('.yzmm').text("重新发送(" + countdown + ")");
                    }
                    setTimeout(function(){aaa()},1000)
                }
                aaa();