如何通过GTM置、读取与删除Cookie？

<script>
  // 名称、值、过期时间可自由改变
  var cookieName = "{{Cookie Name}}"; 
  var cookieValue = "{{Cookie Value}}"; 
  var cookieDays = {{Cookie Days}}; // 数字

  var maxAge = cookieDays * 24 * 60 * 60;

  document.cookie = cookieName + "=" + cookieValue 
      + "; path=/"
      + "; max-age=" + maxAge
      + "; SameSite=Lax"
      + "; Secure";   // HTTPS 网站必须加
</script>

<script>
  var cookieName = "{{Cookie Name}}";

  document.cookie = cookieName + "=; path=/; max-age=0; SameSite=Lax; Secure";
</script>