W3School TIY Editor
W3School 在线教程
改变方向
暗黑模式
运行代码
<!DOCTYPE html> <html> <head> <style> p#demo { text-decoration: underline; } </style> </head> <body> <p id="demo"> Hello world! </p> <p>点击“试一试”按钮可改变下划线的颜色。</p> <button onclick="myFunction()">试一试</button> <script> function myFunction() { document.getElementById("demo").style.textDecorationColor = "red"; } </script> </body> </html>