主页
CSS 参考手册
CSS border-top 属性
trycss_js_border-top
运行 ❯
×
更改方向
保存代码
更改主题
<!DOCTYPE html> <html> <head> <style> #myDIV { border: 1px solid black; width: 300px; height: 300px; } </style> </head> <body> <h1>Change border-top with JavaScript</h1> <p>Click the "Try it" button to change the border-top property of the DIV element:</p> <button onclick="myFunction()">Try it</button> <div id="myDIV"> <h1>Hello</h1> </div> <script> function myFunction() { document.getElementById("myDIV").style.borderTop = "3px dashed lightblue"; } </script> </body> </html>