<script type="text/javascript">
function document.onkeydown(){                //网页内按下回车触发
    if(event.keyCode==13)
    {
        document.getElementById("Button").click();   
        return false;                               
    }
}
</script>

<script type="text/javascript">
document.onkeydown=ShowEnterKey;
 if   (event.keyCode==13)   
 {   
  event.keyCode=0;
  event.returnValue   =   false;
  alert("hhaha");
 } 
}
</script>