javascript - 使用 cookie 设置访问倒计时

Question

我的网站使用了一个反广告拦截器来阻止人们进入它，但是没有人喜欢看广告，所以我决定寻找一种方法让新访问者在禁用该消息之前使用该网站几次广告 block 出现。

我尝试用cookie记录一个数字，每次访问的人减去数字，删除旧的cookie，创建一个减去数字的新cookie，所以当数字等于0时出现防广告，但让我感到困惑的是，我才刚刚开始学习 javascript。

有没有更简单的方法来做到这一点，或者 cookie 是最好的选择？我该怎么做？

我的反广告拦截示例页面:https://www.stackexample.ml/adblock

我的反广告拦截代码:

NOTE: My website is static.

window.onload = function a() {
  var div1 = document.getElementById("off");
  var div2 = document.getElementById("on");
  var div3 = document.getElementById("carregando");
  var span = document.getElementById("v");
  var b = document.getElementById("b");
  var url = new URL(window.location);
  var r = url.searchParams.get("r");
  var enc1 = window.atob(r);

if( window.canRunAds === undefined ){
  div2.style.display="block"
  div3.style.display="none"
  b.style.display="block"
  span.style.color="#d06079"
  span.innerHTML="Desative o Adblock"
}else{
  div1.style.display="block"
  div3.style.display="none"
  span.innerHTML="Adblock desativado"
  //código para liberar a pagina aqui
}  
};

.cont {
  width:320px;
  margin:18% auto;
}
#b {
  border:1px solid #ba5269;
  background-color:#d06079;
  color:white;
  border-radius:6px;
  padding:15px;
  font-size:18px;
  display:none;
  margin:25px auto;
}
#on{
  display:none;
  margin:22px auto;
}
.check_mark {
  width: 80px;
  height: 130px;
  margin: 0 auto;
  display:none;
}
#v {
  font-family:arial;
  font-size:35px;
  color:green;
  display:block;
  text-align:center;
}

button {
  cursor: pointer;
  margin-left: 15px;
}

.hide{
  display:none;
}

.sa-icon {
  width: 80px;
  height: 80px;
  border: 4px solid gray;
  -webkit-border-radius: 40px;
  border-radius: 40px;
  border-radius: 50%;
  margin: 20px auto;
  padding: 0;
  position: relative;
  box-sizing: content-box;
}

.sa-icon.sa-success {
  border-color: #4CAF50;
}

.sa-icon.sa-success::before, .sa-icon.sa-success::after {
  content: '';
  -webkit-border-radius: 40px;
  border-radius: 40px;
  border-radius: 50%;
  position: absolute;
  width: 60px;
  height: 120px;
  background: white;
  -webkit-transform: rotate(45deg);
  transform: rotate(45deg);
}

.sa-icon.sa-success::before {
  -webkit-border-radius: 120px 0 0 120px;
  border-radius: 120px 0 0 120px;
  top: -7px;
  left: -33px;
  -webkit-transform: rotate(-45deg);
  transform: rotate(-45deg);
  -webkit-transform-origin: 60px 60px;
  transform-origin: 60px 60px;
}

.sa-icon.sa-success::after {
  -webkit-border-radius: 0 120px 120px 0;
  border-radius: 0 120px 120px 0;
  top: -11px;
  left: 30px;
  -webkit-transform: rotate(-45deg);
  transform: rotate(-45deg);
  -webkit-transform-origin: 0px 60px;
  transform-origin: 0px 60px;
}

.sa-icon.sa-success .sa-placeholder {
  width: 80px;
  height: 80px;
  border: 4px solid rgba(76, 175, 80, .5);
  -webkit-border-radius: 40px;
  border-radius: 40px;
  border-radius: 50%;
  box-sizing: content-box;
  position: absolute;
  left: -4px;
  top: -4px;
  z-index: 2;
}

.sa-icon.sa-success .sa-fix {
  width: 5px;
  height: 90px;
  background-color: white;
  position: absolute;
  left: 28px;
  top: 8px;
  z-index: 1;
  -webkit-transform: rotate(-45deg);
  transform: rotate(-45deg);
}

.sa-icon.sa-success.animate::after {
  -webkit-animation: rotatePlaceholder 4.25s ease-in;
  animation: rotatePlaceholder 4.25s ease-in;
}

.sa-icon.sa-success {
  border-color: transparent\9;
}
.sa-icon.sa-success .sa-line.sa-tip {
  -ms-transform: rotate(45deg) \9;
}
.sa-icon.sa-success .sa-line.sa-long {
  -ms-transform: rotate(-45deg) \9;
}

.animateSuccessTip {
  -webkit-animation: animateSuccessTip 0.75s;
  animation: animateSuccessTip 0.75s;
}

.animateSuccessLong {
  -webkit-animation: animateSuccessLong 0.75s;
  animation: animateSuccessLong 0.75s;
}

@-webkit-keyframes animateSuccessLong {
  0% {
    width: 0;
    right: 46px;
    top: 54px;
  }
  65% {
    width: 0;
    right: 46px;
    top: 54px;
  }
  84% {
    width: 55px;
    right: 0px;
    top: 35px;
  }
  100% {
    width: 47px;
    right: 8px;
    top: 38px;
  }
}
@-webkit-keyframes animateSuccessTip {
  0% {
    width: 0;
    left: 1px;
    top: 19px;
  }
  54% {
    width: 0;
    left: 1px;
    top: 19px;
  }
  70% {
    width: 50px;
    left: -8px;
    top: 37px;
  }
  84% {
    width: 17px;
    left: 21px;
    top: 48px;
  }
  100% {
    width: 25px;
    left: 14px;
    top: 45px;
  }
}
@keyframes animateSuccessTip {
  0% {
    width: 0;
    left: 1px;
    top: 19px;
  }
  54% {
    width: 0;
    left: 1px;
    top: 19px;
  }
  70% {
    width: 50px;
    left: -8px;
    top: 37px;
  }
  84% {
    width: 17px;
    left: 21px;
    top: 48px;
  }
  100% {
    width: 25px;
    left: 14px;
    top: 45px;
  }
}

@keyframes animateSuccessLong {
  0% {
    width: 0;
    right: 46px;
    top: 54px;
  }
  65% {
    width: 0;
    right: 46px;
    top: 54px;
  }
  84% {
    width: 55px;
    right: 0px;
    top: 35px;
  }
  100% {
    width: 47px;
    right: 8px;
    top: 38px;
  }
}

.sa-icon.sa-success .sa-line {
  height: 5px;
  background-color: #4CAF50;
  display: block;
  border-radius: 2px;
  position: absolute;
  z-index: 2;
}

.sa-icon.sa-success .sa-line.sa-tip {
  width: 25px;
  left: 14px;
  top: 46px;
  -webkit-transform: rotate(45deg);
  transform: rotate(45deg);
}

.sa-icon.sa-success .sa-line.sa-long {
  width: 47px;
  right: 8px;
  top: 38px;
  -webkit-transform: rotate(-45deg);
  transform: rotate(-45deg);
}

@-webkit-keyframes rotatePlaceholder {
  0% {
    transform: rotate(-45deg);
    -webkit-transform: rotate(-45deg);
  }
  5% {
    transform: rotate(-45deg);
    -webkit-transform: rotate(-45deg);
  }
  12% {
    transform: rotate(-405deg);
    -webkit-transform: rotate(-405deg);
  }
  100% {
    transform: rotate(-405deg);
    -webkit-transform: rotate(-405deg);
  }
}
@keyframes rotatePlaceholder {
  0% {
    transform: rotate(-45deg);
    -webkit-transform: rotate(-45deg);
  }
  5% {
    transform: rotate(-45deg);
    -webkit-transform: rotate(-45deg);
  }
  12% {
    transform: rotate(-405deg);
    -webkit-transform: rotate(-405deg);
  }
  100% {
    transform: rotate(-405deg);
    -webkit-transform: rotate(-405deg);
  }
}

.loading {
    border: 4px solid #3a3;
    border-right: 4px solid #a5d7a7;
    border-bottom: 4px solid #a5d7a7;
    height: 80px;
    width: 80px;
    border-radius: 50%;
    -webkit-animation: loading 1s infinite linear;
    -moz-animation: loading 1s infinite linear;
    -o-animation: loading 1s infinite linear;
    animation: loading 1s infinite linear;
    margin:22px auto;
}
@-webkit-keyframes loading {
    from {
        -webkit-transform: rotate(0deg);
    }
    to {
        -webkit-transform: rotate(360deg);
    }
}
@-moz-keyframes loading {
    from {
        -moz-transform: rotate(0deg);
    }
    to {
        -moz-transform: rotate(360deg);
    }
}
@-o-keyframes loading {
    from {
        -o-transform: rotate(0deg);
    }
    to {
        -o-transform: rotate(360deg);
    }
}
@keyframes loading {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}
.abgne-loading-20140104-2 {
    position: relative;
    height: 100px;
    width: 100px;
}
.abgne-loading-20140104-2 .loading {
    border: 6px solid #168;
    border-right: 6px solid #fff;
    border-bottom: 6px solid #fff;
    height: 100%;
    width: 100%;
    border-radius: 50%;
    -webkit-animation: loading 1s infinite linear;
    -moz-animation: loading 1s infinite linear;
    -ms-animation: loading 1s infinite linear;
    -o-animation: loading 1s infinite linear;
    animation: loading 1s infinite linear;
}
.abgne-loading-20140104-2 .word {
    color: #168;
    position: absolute;
    top: 0;
    left: 0;
    display: inline-block;
    text-align: center;
    font-size: 72px;
    line-height: 72px;
    font-family: arial;
    margin: 18px 0 0 20px;
    padding: 0;
}

<!DOCTYPE html>
<html>
<head>
<title>Verificando Adblock</title>
<script src="https://www.stackexample.ml/js/ads.js"></script>
</head>
<body>
<div class="cont">
<span id="v">Verificando adblock</span>
<div id="carregando" class="loading"></div>
<img src="https://www.stackexample.ml/falhou.png" alt="Smiley face" height="90" width="90" id="on">
<div id="off" class="check_mark">
  <div class="sa-icon sa-success animate">
    <span class="sa-line sa-tip animateSuccessTip"></span>
    <span class="sa-line sa-long animateSuccessLong"></span>
    <div class="sa-placeholder"></div>
    <div class="sa-fix"></div>
  </div>
</div>
<button id="b" onclick="window.location.reload()">Já desativei, Continuar...</button>
</div>
</body>
</html>

Answer 1

如果您希望维护一个计数器，您可以使用本地存储来实现相同的......例如，

Note: You won't be able to run this code here due to the restrictions by StackOverflow, as am using localStorage

您可以在此处查看它的运行情况(继续刷新页面 3 次，您就会看到)- https://codepen.io/anon/pen/qvaYQK

在这里，如果没有找到，我将 adcounter 的计数器初始化为 1，如果找到，我只是在广告被阻止时增加它，如果它超过 3，我只是向用户显示模态.如果用户禁用广告拦截，我会将计数器重置为 0。

我也对你的代码进行了一些重构，还有大量代码仍然可以重构。

window.onload = function a() {
  var div1 = document.getElementById("off");
  var div2 = document.getElementById("on");
  var div3 = document.getElementById("carregando");
  var span = document.getElementById("v");
  var b = document.getElementById("b");
  var url = new URL(window.location);
  var r = url.searchParams.get("r");
  var enc1 = window.atob(r);
  var getWrapper = document.getElementById('ad-blocker-modal');
  var showModalAfterVisits = 3; //show modal after 3 visits
  var getCounter = localStorage.getItem('adcounter');
  
  if(!getCounter) {
    localStorage.setItem('adcounter', 0); // initialize Local Storage
  }

  function checkForAdBlocker() {
    if (!window.canRunAds) {
      if(getCounter < 3) {
        //keep incrementing the counter unless the counter reaches 3 and return
        localStorage.setItem('adcounter', ++getCounter);
        return;
      }

      getWrapper.classList.remove('hide');
      div2.style.display = "block"
      div3.style.display = "none"
      b.style.display = "block"
      span.style.color = "#d06079"
      span.innerHTML = "Desative o Adblock"
    } else {
      localStorage.setItem('adcounter', 0); //reset if adblock is disabled
      div1.style.display = "block"
      div3.style.display = "none"
      span.innerHTML = "Adblock desativado"
    }
  }

  checkForAdBlocker();
};

.cont {
  width: 320px;
  margin: 18% auto;
}

.hide {
  display: none;
}

#ad-blocker-modal {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #fff;
}

#b {
  border: 1px solid #ba5269;
  background-color: #d06079;
  color: white;
  border-radius: 6px;
  padding: 15px;
  font-size: 18px;
  display: none;
  margin: 25px auto;
}

#on {
  display: none;
  margin: 22px auto;
}

.check_mark {
  width: 80px;
  height: 130px;
  margin: 0 auto;
  display: none;
}

#v {
  font-family: arial;
  font-size: 35px;
  color: green;
  display: block;
  text-align: center;
}

button {
  cursor: pointer;
  margin-left: 15px;
}

.hide {
  display: none;
}

.sa-icon {
  width: 80px;
  height: 80px;
  border: 4px solid gray;
  border-radius: 40px;
  border-radius: 50%;
  margin: 20px auto;
  padding: 0;
  position: relative;
  box-sizing: content-box;
}

.sa-icon.sa-success {
  border-color: #4CAF50;
}

.sa-icon.sa-success::before,
.sa-icon.sa-success::after {
  content: '';
  border-radius: 40px;
  border-radius: 50%;
  position: absolute;
  width: 60px;
  height: 120px;
  background: white;
  transform: rotate(45deg);
}

.sa-icon.sa-success::before {
  border-radius: 120px 0 0 120px;
  top: -7px;
  left: -33px;
  transform: rotate(-45deg);
  transform-origin: 60px 60px;
}

.sa-icon.sa-success::after {
  border-radius: 0 120px 120px 0;
  top: -11px;
  left: 30px;
  transform: rotate(-45deg);
  transform-origin: 0px 60px;
}

.sa-icon.sa-success .sa-placeholder {
  width: 80px;
  height: 80px;
  border: 4px solid rgba(76, 175, 80, .5);
  border-radius: 40px;
  border-radius: 50%;
  box-sizing: content-box;
  position: absolute;
  left: -4px;
  top: -4px;
  z-index: 2;
}

.sa-icon.sa-success .sa-fix {
  width: 5px;
  height: 90px;
  background-color: white;
  position: absolute;
  left: 28px;
  top: 8px;
  z-index: 1;
  transform: rotate(-45deg);
}

.sa-icon.sa-success.animate::after {
  animation: rotatePlaceholder 4.25s ease-in;
}

.animateSuccessTip {
  animation: animateSuccessTip 0.75s;
}

.animateSuccessLong {
  animation: animateSuccessLong 0.75s;
}

@keyframes animateSuccessTip {
  0% {
    width: 0;
    left: 1px;
    top: 19px;
  }
  54% {
    width: 0;
    left: 1px;
    top: 19px;
  }
  70% {
    width: 50px;
    left: -8px;
    top: 37px;
  }
  84% {
    width: 17px;
    left: 21px;
    top: 48px;
  }
  100% {
    width: 25px;
    left: 14px;
    top: 45px;
  }
}

@keyframes animateSuccessLong {
  0% {
    width: 0;
    right: 46px;
    top: 54px;
  }
  65% {
    width: 0;
    right: 46px;
    top: 54px;
  }
  84% {
    width: 55px;
    right: 0px;
    top: 35px;
  }
  100% {
    width: 47px;
    right: 8px;
    top: 38px;
  }
}

.sa-icon.sa-success .sa-line {
  height: 5px;
  background-color: #4CAF50;
  display: block;
  border-radius: 2px;
  position: absolute;
  z-index: 2;
}

.sa-icon.sa-success .sa-line.sa-tip {
  width: 25px;
  left: 14px;
  top: 46px;
  transform: rotate(45deg);
}

.sa-icon.sa-success .sa-line.sa-long {
  width: 47px;
  right: 8px;
  top: 38px;
  transform: rotate(-45deg);
}

@keyframes rotatePlaceholder {
  0% {
    transform: rotate(-45deg);
  }
  5% {
    transform: rotate(-45deg);
  }
  12% {
    transform: rotate(-405deg);
  }
  100% {
    transform: rotate(-405deg);
  }
}

.loading {
  border: 4px solid #3a3;
  border-right-color: a5d7a7;
  border-bottom-color: #a5d7a7;
  height: 80px;
  width: 80px;
  border-radius: 50%;
  animation: loading 1s infinite linear;
  margin: 22px auto;
}

@keyframes loading {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.abgne-loading-20140104-2 {
  position: relative;
  height: 100px;
  width: 100px;
}

.abgne-loading-20140104-2 .loading {
  border: 6px solid #168;
  border-right-color: #fff;
  border-bottom: #fff;
  height: 100%;
  width: 100%;
  border-radius: 50%;
  animation: loading 1s infinite linear;
}

.abgne-loading-20140104-2 .word {
  color: #168;
  position: absolute;
  top: 0;
  left: 0;
  display: inline-block;
  text-align: center;
  font-size: 72px;
  line-height: 72px;
  font-family: arial;
  margin: 18px 0 0 20px;
  padding: 0;
}

<!DOCTYPE html>
<html>

<head>
  <title>Verificando Adblock</title>
  <script src="https://www.stackexample.ml/js/ads.js"></script>
</head>

<body>
  Some content on my Website
  <div id="ad-blocker-modal" class="hide">
    <div class="cont">
      <span id="v">Verificando adblock</span>
      <div id="carregando" class="loading"></div>
      <img src="https://www.stackexample.ml/falhou.png" alt="Smiley face" height="90" width="90" id="on">
      <div id="off" class="check_mark">
        <div class="sa-icon sa-success animate">
          <span class="sa-line sa-tip animateSuccessTip"></span>
          <span class="sa-line sa-long animateSuccessLong"></span>
          <div class="sa-placeholder"></div>
          <div class="sa-fix"></div>
        </div>
      </div>
      <button id="b" onclick="window.location.reload()">Já desativei, Continuar...</button>
    </div>
  </div>
</body>
</html>