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<!DOCTYPE html> <html> <body> <p>单击该按钮可创建注释并将其添加到 HTML 文档。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var c = document.createComment("My personal comments"); document.body.appendChild(c); var x = document.getElementById("demo"); x.innerHTML = "此文档中添加了注释，但如您所知，注释是不可见的。"; } </script> </body> </html>