W3School TIY Editor
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<!DOCTYPE html> <html> <body> <head> <meta name="description" content="免费的 Web 教程"> <meta name="keywords" content="HTML5,CSS,JavaScript"> <meta name="author" content="Bill Gates"> </head> <p>点击按钮可返回所有 meta 元素的 name 属性值。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementsByTagName("META"); var txt = ""; var i; for (i = 0; i <x.length; i++) { txt = txt + (i+1) + ". meta 标签的" + "名称：" + x[i].name + "<br>"; } document.getElementById("demo").innerHTML = txt; } </script> </body> </html>