W3School TIY Editor
W3School 在线教程
改变方向
暗黑模式
运行代码
<!DOCTYPE html> <html> <body> <p>请在下面的列表中选择一种显示类型以更改 <span id="mySpan" style="color:blue;">此 span 元素的</span> 显示类型。</p> <select onchange="myFunction(this);" size="3"> <option>block <option>inline <option>none </select> <script> function myFunction(x) { var whichSelected = x.selectedIndex; var sel = x.options[whichSelected].text; var elem = document.getElementById("mySpan"); elem.style.display = sel; } </script> </body> </html>