<SCRIPT>
function fnTrapKD(){
if(oTrap.checked){
oOutput.innerText+="[trap = " + event.keyCode + "]";
event.returnValue=false;
}
else{
oOutput.innerText+=String.fromCharCode(event.keyCode);
}
}
</SCRIPT>
<INPUT TYPE="checkbox" ID="oTrap" checked>显示按键的keyCode<br />
在该输入框按键：<INPUT ID="oExample" TYPE="text" onkeydown="fnTrapKD()"><br />
<TEXTAREA ID="oOutput" ROWS="10" COLS="50">
</TEXTAREA>
--------取得按键的ASCII吗的值
<body onKeyDown="alert(event.keyCode)">按键盘看看,
