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<!DOCTYPE html> <html> <body> <h1>HTMLCollection namedItem() 方法</h1> <p id="myElement">namedItem() 方法返回具有指定 ID 或名称的元素。</p> <p>点击按钮返回ID为“myElement”的P元素的内容：</p> <button onclick="myFunction()">P 的警报 innerHTML</button> <script> function myFunction() { var x = document.getElementsByTagName("P").namedItem("myElement"); alert(x.innerHTML); } </script> </body> </html>