显示 HTTP 头部信息 - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>蜜蜂教程(mifengjc.com)</title>
  <meta http-equiv="content-type" content="text/html;charset=utf-8">
  <script>
    function displayResult() {
      var x = document.getElementsByTagName("meta")[0].httpEquiv;
      alert(x);
    }
  </script>
</head>
<body>

  <button type="button" onclick="displayResult()">显示 HTTP-Equiv</button>

</body>
</html>
        