W3School TIY
编辑您的代码：
<html> <head> <script type="text/javascript"> function removeLastOption() { var x=document.getElementById("mySelect") if (x.length>0) { x.remove(x.length-1); } } </script> </head> <body> <form> <select id="mySelect"> <option>Apple</option> <option>Pear</option> <option>Banana</option> <option>Orange</option> </select> <input type="button" onclick="removeLastOption()" value="Remove last option"> </form> </body> </html>
查看结果: