keyCode

<script>
function keypress(){
ns4=(document.layers)?true:false;
ie4=(document.all)?true:false;

if(ns4){
alert("n");
var nkey=e.which;
var iekey="现在是ns浏览器";
var realkey=String.fromCharCode(e.which);
}
var e
if(ie4){

e=event.keyCode;

var nkey="现在是ie浏览器";
var realkey=String.fromCharCode(event.keyCode);
alert(e);
alert(realkey);
}


if(e.keyCode==13){
var s=document.getElementById("t").value;
alert(13);

}
}
</script>

<input type=text id="t" onKeypress="keypress();">


<script>
function keypress(e){

if(e.keyCode==13){
alert("12");
alert(String.fromCharCode(e.keyCode))
}
}
</script>

<input type=text id="t" onKeypress="keypress(event);">