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<!DOCTYPE html> <html> <body> <p>请在下拉列表中选择一个选项并显示该选项。</p> <form> <select id="mySelect" onchange="myFunction()"> <option>苹果</option> <option>桔子</option> <option>凤梨</option> <option>香蕉</option> </select> </form> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("mySelect"); var i = x.selectedIndex; document.getElementById("demo").innerHTML = x.options[i].text; } </script> </body> </html>