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 setFontSize() { document.getElementById("p1").style.fontSize="larger"; } </script> </head> <body> <p id="p1">This is an example paragraph.</p> <input type="button" onclick="setFontSize()" value="Change font-size" /> </body> </html>