这个是捕获键盘事件输入状态的js代码，它可以判断你敲打了键盘的那个键，ctrl、shift，26个字母等等，返回具体键盘值。
Javascript:keyCode键盘键码值表
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>键盘事件全面控制 - 中国asp之家</title> <STYLE TYPE="text/css"> TD {text-align:center} </STYLE> <SCRIPT LANGUAGE="JavaScript"> function init() { document.onkeydown = showKeyDown document.onkeyup = showKeyUp document.onkeypress = showKeyPress } function showKeyDown(evt) { evt = (evt) ? evt : window.event document.getElementById("pressKeyCode").innerHTML = 0 document.getElementById("upKeyCode").innerHTML = 0 document.getElementById("pressCharCode").innerHTML = 0 document.getElementById("upCharCode").innerHTML = 0 restoreModifiers("") restoreModifiers("Down") restoreModifiers("Up") document.getElementById("downKeyCode").innerHTML = evt.keyCode if (evt.charCode) { document.getElementById("downCharCode").innerHTML = evt.charCode } showModifiers("Down", evt) } function showKeyUp(evt) { evt = (evt) ? evt : window.event document.getElementById("upKeyCode").innerHTML = evt.keyCode if (evt.charCode) { document.getElementById("upCharCode").innerHTML = evt.charCode } showModifiers("Up", evt) return false } function showKeyPress(evt) { evt = (evt) ? evt : window.event document.getElementById("pressKeyCode").innerHTML = evt.keyCode if (evt.charCode) { document.getElementById("pressCharCode").innerHTML = evt.charCode } showModifiers("", evt) return false } function showModifiers(ext, evt) { restoreModifiers(ext) if (evt.shiftKey) { document.getElementById("shift" + ext).style.backgroundColor = "#ff0000" } if (evt.ctrlKey) { document.getElementById("ctrl" + ext).style.backgroundColor = "#00ff00" } if (evt.altKey) { document.getElementById("alt" + ext).style.backgroundColor = "#0000ff" } } function restoreModifiers(ext) { document.getElementById("shift" + ext).style.backgroundColor = "#ffffff" document.getElementById("ctrl" + ext).style.backgroundColor = "#ffffff" document.getElementById("alt" + ext).style.backgroundColor = "#ffffff" } </SCRIPT> </HEAD> <BODY onLoad="init()"> <H1>Keyboard Event Handler Lab</H1> <HR> <FORM> <TABLE BORDER=2 CELLPADDING=2> <TR><TH></TH><TH>onKeyDown</TH><TH>onKeyPress</TH><TH>onKeyUp</TH></TR> <TR><TH>Key Codes</TH> <TD ID="downKeyCode">0</TD> <TD ID="pressKeyCode">0</TD> <TD ID="upKeyCode">0</TD> </TR> <TR><TH>Char Codes (IE5/Mac; NN6)</TH> <TD ID="downCharCode">0</TD> <TD ID="pressCharCode">0</TD> <TD ID="upCharCode">0</TD> </TR> <TR><TH ROWSPAN=3>Modifier Keys</TH> <TD><SPAN ID="shiftDown">Shift</SPAN></TD> <TD><SPAN ID="shift">Shift</SPAN></TD> <TD><SPAN ID="shiftUp">Shift</SPAN></TD> </TR> <TR> <TD><SPAN ID="ctrlDown">Ctrl</SPAN></TD> <TD><SPAN ID="ctrl">Ctrl</SPAN></TD> <TD><SPAN ID="ctrlUp">Ctrl</SPAN></TD> </TR> <TR> <TD><SPAN ID="altDown">Alt</SPAN></TD> <TD><SPAN ID="alt">Alt</SPAN></TD> <TD><SPAN ID="altUp">Alt</SPAN></TD> </TR> </TABLE> </FORM> </BODY> </HTML> [提示：你可先修改部分代码，再按运行]
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