禁止页面刷新后退兼容IE火狐键盘事件注册

<script    language="javascript">         
//禁止用F5键         
function    document.onkeydown()         
{         
          if    (    event.keyCode==116)         
           {         
                   event.keyCode    =    0;         
                   event.cancelBubble    =   true;         
                  return   false;         
           }         
}         
          
//禁止右键弹出菜单         
function    document.oncontextmenu()         
{         
      return   false;         
}         
          
//下面代码实现全屏显示         
function    window.onload(){         
      var    Request    =   new    Array();//保存参数         
      var    s    =    location.search.substring(1);         
      if    (s    &&    s!=""){         
      var    list    =    s.split("&");         
for    (var    i=0;    i    <    list.length;    i++){         
var    pair    =    list[i].split("=");         
if    (pair[0]    &&    pair[0]    !=""){         
Request[unescape(pair[0])]    =    unescape(pair[1]);         
}         
}         
       }         
          
      var    fullscreen=Request["fullscreen"];         
      if(fullscreen!="yes"){         
      var    file    =self.location;         
      var    a    =    window.open("about:blank","","fullscreen=yes")         
       self.opener=null         
       self.close()         
       a.location=file    +   "?fullscreen=yes";         
       }         
}         
</script>     
<script language="Javascript"><!--      
//屏蔽鼠标右键、Ctrl+N、Shift+F10、F11、F5刷新、退格键      
//Author: meizz(梅花雨) 2002-6-18      
function document.oncontextmenu(){event.returnValue=false;}//屏蔽鼠标右键      
function window.onhelp(){return false} //屏蔽F1帮助      
function document.onkeydown()      
{      
if ((window.event.altKey)&&      
((window.event.keyCode==37)|| //屏蔽 Alt+ 方向键 ←      
(window.event.keyCode==39))) //屏蔽 Alt+ 方向键 →      
{      
alert("不准你使用ALT+方向键前进或后退网页！");      
event.returnValue=false;      
}      
/* 注：这还不是真正地屏蔽 Alt+ 方向键，  
因为 Alt+ 方向键弹出警告框时，按住 Alt 键不放，  
用鼠标点掉警告框，这种屏蔽方法就失效了。以后若  
有哪位高手有真正屏蔽 Alt 键的方法，请告知。*/      
if ((event.keyCode==8) || //屏蔽退格删除键      
(event.keyCode==116)|| //屏蔽 F5 刷新键      
(event.ctrlKey && event.keyCode==82)){ //Ctrl + R      
event.keyCode=0;      
event.returnValue=false;      
}      
if (event.keyCode==122){event.keyCode=0;event.returnValue=false;} //屏蔽F11      
if (event.ctrlKey && event.keyCode==78) event.returnValue=false; //屏蔽 Ctrl+n      
if (event.shiftKey && event.keyCode==121)event.returnValue=false; //屏蔽 shift+F10      
if (window.event.srcElement.tagName == "A" && window.event.shiftKey)      
window.event.returnValue = false; //屏蔽 shift 加鼠标左键新开一网页      
if ((window.event.altKey)&&(window.event.keyCode==115)) //屏蔽Alt+F4      
{      
window.showModelessDialog("about:blank","","dialogWidth:1px;dialogheight:1px");      
return false;      
}      
}      
</script>

兼容IE火狐键盘事件注册
document.onkeydown = function (e){  
            var theEvent = window.event || e;  
            var code = theEvent.keyCode || theEvent.which;  
            if(code == 13){  
            alert(code);  
               }  
}