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;
}

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.class="lazy" data-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>