判断是否长按某一键
<html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> <script type="text/javascript"> var lastkeyCode = -1; function TestKeyDown(event) { if (event.keyCode == lastkeyCode) { alert("重复按下了某个按键!"); //处理 } lastkeyCode = event.keyCode; } </script> </head> <body> <input type="text" value="Test" οnkeydοwn="TestKeyDown(event);" /> </body> </html>