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<!DOCTYPE html> <html> <body> <h3>如何访问 OPTGROUP 元素的演示</h3> <select size="4"> <optgroup id="myOptgroup" label="Swedish Cars"> <option value="volvo">Volvo</option> <option value="saab">Saab</option> <option value="koenigsegg">Koenigsegg</option> </optgroup> </select> <p>单击按钮获取选项组的标签/描述。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myOptgroup").label; document.getElementById("demo").innerHTML = x; } </script> </body> </html>