js禁止页面刷新禁止用F5键刷新禁止右键的示例代码

<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>