<script language='javascript'>
document.onkeydown=function(){
if (event.keyCode == 13){
alert('回车键.');
}
else{
alert('你按错了键.');
}
}
</script>
<script language='javascript'>
document.onkeydown=function(){
if (event.keyCode == 13){
alert('回车键.');
}
else{
alert('你按错了键.');
}
}
</script>