源代码 ：
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>开源教程(ossoft.cn)</title> </head> <head> <script> function lighton(){ document.getElementById('myimage').src="bulbon.gif"; } function lightoff(){ document.getElementById('myimage').src="bulboff.gif"; } </script> </head> <body> <img id="myimage" onmousedown="lighton()" onmouseup="lightoff()" src="bulboff.gif" width="100" height="180" /> <p>点击不释放鼠标灯将一直亮着!</p> </body> </html>
运行结果