为同意页面设置cookie

Question

我在下面有这个项目来测试我的同意覆盖页面。

警告页面工作正常，但不保存您的选项。因此，如果您进入网站，通过它导航然后再返回主页，您将再次看到同意覆盖。

有没有办法使用cookies保存选项？

Project（ SFW ）

使用同意覆盖页面代码的代码段

提前谢谢！

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function openDialog() {
  document.documentElement.style.overflow = "hidden";
}

function closeDialog() {
  document.getElementById("warning").classList.remove("show")
  document.getElementById("warning").classList.add("hide");
}

openDialog();

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body,
html {
  overflow: hidden;
  height: 100%;
  margin: 0;
}

.consent-overlay {
  position: fixed;
  z-index: 999;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}

.consent {
  background: #000000;
  height: 100%;
  background-position: center;
  background-size: cover;
  position: relative;
  color: #f8f8f8;
  font-family: inherit;
}

.consent-content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

.consent-content h1 {
  text-transform: uppercase;
  font-size: 1.4rem;
  font-weight: 300;
  letter-spacing: .1rem;
  text-indent: .1rem;
  margin-top: 40px;
}

.button {
  text-decoration: none;
  display: inline-block;
  font-size: 35px;
  cursor: pointer;
  padding: 30px 30px;
  margin: 0px auto;
  letter-spacing: 1.2rem;
}

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<link href='https://fonts.googleapis.com/css?family=Raleway:100,200,300,400,500,600,700,800,900' rel='stylesheet' type='text/css'>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.3/css/bootstrap.min.css" integrity="sha384-Zug+QiDoJOrZ5t4lssLdxGhVrurbmBWopoEl+M6BdEfwnCJZtKxi1KgxUyJq13dy" crossorigin="anonymous">


<div id="warning" class="consent-overlay show">
  <div class="consent">
    <div class="consent-content">
      <img src="https://i.imgur.com/OtN0ZEJ.png" width="200" height="200">
      <h1>Este website exibe contéudo explícito!</h1>
      <div class="button">
        <button type="button" class="btn btn-outline-success" onclick="closeDialog(&quot;warning&quot;)">Tenho mais de 18 anos</button>
        <button type="button" class="btn btn-outline-danger" onclick="location.href='https://www.webnode.com.br';">Tenho menos de 18 anos</button>
      </div>
    </div>
  </div>
</div>

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