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 setFontWeight() { document.getElementById("p1").style.fontWeight="900"; } </script> </head> <body> <p id="p1">This is an example paragraph.</p> <p>This is another example paragraph.</p> <input type="button" onclick="setFontWeight()" value="Display bold text" /> </body> </html>