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<!DOCTYPE html> <html> <body> <p>单击按钮获取选择元素的第一个子元素的文本。</p> <select id="mySelect" size="4"> <option>Audi</option> <option>BMW</option> <option>Saab</option> <option>Volvo</option> </select> <br><br> <button onclick="myFunction()">试一试</button> <p><strong>注意：</strong> IE8 及更早版本不支持 firstElementChild 属性。</p> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("mySelect").firstElementChild.text; document.getElementById("demo").innerHTML = x; } </script> </body> </html>