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<!DOCTYPE html> <html> <head> <meta name="description" content="免费网络教程"> </head> <body> <h3>如何访问 META 元素的演示</h3> <p>点击按钮获取元信息的内容。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementsByTagName("META")[0].content; document.getElementById("demo").innerHTML = x; } </script> </body> </html>