打开一个输出流并添加文本，然后关闭输出流 - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>蜜蜂教程(mifengjc.com)</title>
  <script>
    function createDoc() {
      var doc = document.open("text/html", "replace");
      var txt = "<!DOCTYPE html><html><body>学习 HTML DOM 很有趣!</body></html>";
      doc.write(txt);
      doc.close();
    }
  </script>
</head>

<body>
  <input type="button" value="新文档" onclick="createDoc()">
</body>
</html>
        