Home
JS
JS
Tryit: JAVASCRIPT
运行 ❯
×
Change Orientation
Change Theme, Dark/Light
<!DOCTYPE html> <html> <body> <p>按住文本字段内的某个键可设置红色背景色。 释放键以设置绿色背景色。</p> <input type="text" id="demo" onkeydown="keydownFunction()" onkeyup="keyupFunction()"> <script> function keydownFunction() { document.getElementById("demo").style.backgroundColor = "red"; } function keyupFunction() { document.getElementById("demo").style.backgroundColor = "green"; } </script> </body> </html>