<script language=javascript>
function key()
{
with(window.event){
alert(keyCode);
}
}
</script>
<input type="text" name="btn" onKeyDown="key()">
function key()
{
with(window.event){
alert(keyCode);
}
}
</script>
<input type="text" name="btn" onKeyDown="key()">
for(var i=0;i<sTest.length;i++){
alert("字符"+sTest.charAt(i)+"的ASCII为:"+sTest.charCodeAt(i));
}var ss="A";
alert("字符"+ss+"的ASCII为:"+ss.charCodeAt(0));