W3School TIY Editor
W3School 在线教程
改变方向
暗黑模式
运行代码
<html> <head> <script type="text/javascript"> function alertValue() { alert(document.getElementById("hidden1").value) } </script> </head> <body> <form> <input type="hidden" id="hidden1" value="W3School" /> <input type="button" id="button1" onclick="alertValue()" value="Show value of the hidden field" /> </form> </body> </html>