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<!DOCTYPE html> <html> <body> <h3>如何访问 FIELDSET 元素的演示</h3> <fieldset id="myFieldset" name="personalia"> Name: <input type="text" name="username"><br> Email: <input type="text" name="usermail"><br> </fieldset> <p>单击按钮禁用字段集。</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { var x = document.getElementById("myFieldset"); x.disabled = true; } </script> </body> </html>