js禁止页面刷新后退

//禁止 浏览器 前进、后退
<body onbeforeunload="history.go(0)">
<script language="JavaScript">
  <!--
  javascript:window.history.forward(1);
file://-->
  </script>


<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>

 

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