显示链接文档的语言 - 在线编辑器

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>蜜蜂教程(mifengjc.com)</title>
  <link id="link1" href="domoarigato.htm" hreflang="ja">
  <script>
    function displayResult() {
      var x = document.getElementById("link1").hreflang;
      alert(x);
    }
  </script>
</head>
<body>

  <button type="button" onclick="displayResult()">显示链接元素的文档语言</button>

</body>
</html>
​x
 
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>蜜蜂教程(mifengjc.com)</title>
  <link id="link1" href="domoarigato.htm" hreflang="ja">
  <script>
    function displayResult() {
      var x = document.getElementById("link1").hreflang;
      alert(x);
    }
  </script>
</head>
<body>
​
  <button type="button" onclick="displayResult()">显示链接元素的文档语言</button>
​
</body>
</html>