Dialog box that cannot be closed by javascript implementation

The bullet box that javascript implementation cannot be closed has seen malicious advertisements on a webpage. Once you close it, it comes out again! Why does JS tell you?

HTML

The pop-up box that cannot be closed!
        
 
 
      
  
  
Call
      
  
  
Quick message
    
 
 
  

CSS

* {Margin: 0; padding: 0; list-style: none; outline: none; box-sizing: border-box; text-decoration: none ;} a {-webkit-touch-callout: none; text-decoration: none }:focus {outline: 0} body {font-family: Helvetica, STHeiTi, "Microsoft YaHei ", sans-serif; color: #595757; background-color: # fff; outline: 0; overflow-x: hidden;-webkit-tap-highlight-color: rgba (0, 0, 0, 0);} img {border: none ;}. whiteColor {color: # fff; text-align: center ;}. flex_parent {display:-webkit-box; display:-moz-box; display:-ms-flexbox; display:-webkit-flex; display: flex ;}. flex_child {-webkit-box-flex: 1;-moz-box-flex: 1;-webkit-flex: 1;-ms-flex: 1; flex: 1 ;} /* middle_box */body {position: relative; background-color: #272822 ;}# middleBox {width: 260px; height: 248px; margin: 0 auto; background-image: url (.. /images/irfa_dog.jpg); background-repeat: no-repeat; background-size: 100% 100%; border-radius: 10px;/* horizontal vertical center */position: fixed; left: 50%; top: 50%; margin-top:-124px;-webkit-transform: translateX (-50%);-moz-transform: translateX (-50%);-o-transform: translateX (-50%);-ms-transform: translateX (-50%); transform: translateX (-50%); z-index: 100 ;}. close_btn {display: block; overflow: hidden; position: absolute; top:-10px; right:-10px ;}. will_close {width: 32px;} # middleBox a {overflow: hidden;} # middleBox a img, # middleBox a span, # middleBox ul li {float: left ;} # middleBox a span {font-size: 16px; color: # fff ;}# middleBox ul {overflow: hidden ;}# middleBox ul li {width: 130px ;} # middleBox ul li a {line-height: 50px; display: block; padding-left: 5px ;}# middleBox ul li a img {width: 30px; margin-right: 2px; margin-top: 8px; margin-left: 5px ;}. btn_tel {background-color: # F92665; border-bottom-left-radius: 10px ;}. btn_chat {background-color: #1ea133; border-bottom-right-radius: 10px ;}. parent_btn {position: absolute; left: 0; bottom: 0 ;}

JS

/** * Created by Administrator on 2016/12/5. */var adv={  p:null,  timer:null,  btn:null,  init:function(){    this.btn=document.getElementById("closeBtn");    this.p=document.getElementById("middleBox");    this.btn.onclick=this.displayNone;  },  displayBlock:function(){    adv.p.style.display="block";  },  displayNone:function(){    adv.p.style.display="none";    timer=setTimeout(function(){      adv.displayBlock();    },3000);  }};window.onload=function(){  adv.init();};