编辑下面的代码:【加编码】
<html> <head> <script> function getLength() { alert(document.getElementById("mySelect").length); } </script> </head> <body> <form> <select id="mySelect"> <option>Apple</option> <option>Pear</option> <option>Banana</option> <option>Orange</option> </select> <input type="button" onclick="getLength()" value="How many options in the list?"> </form> </body> </html>
结果: 【此窗口】 帮助?
Try it Yourself - © 自强学堂