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<!DOCTYPE html> <html> <body> First Name: <input name="fname" type="text" value="Michael"><br> First Name: <input name="fname" type="text" value="Doug"> <p>单击该按钮可获取文档中具有值为“fname”的名称属性的第一个元素的标签名称。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementsByName("fname")[0].tagName; document.getElementById("demo").innerHTML = x; } </script> </body> </html>