下面的例子可返回页面的基准 URL - 在线编辑器

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>蜜蜂教程(mifengjc.com)</title>
  <base id="htmldom" href="https://www.mifengjc.com/js-ref/">
</head>
<body>

  <p>基础URL 是:
    <script>
      document.write(document.getElementById("htmldom").href);
    </script>
  </p>

</body>
</html>
​x
 
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>蜜蜂教程(mifengjc.com)</title>
  <base id="htmldom" href="https://www.mifengjc.com/js-ref/">
</head>
<body>
​
  <p>基础URL 是:
    <script>
      document.write(document.getElementById("htmldom").href);
    </script>
  </p>
​
</body>
</html>