js禁止页面刷新退后 _JavaScript

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">
　　
　　</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>
<script>? ??
???function?KeyDown(){?//屏蔽鼠标右键、Ctrl+n、shift+F10、F5刷新、退格键? ??
????//alert("ASCII代码是："+event.keyCode);? ??
????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.keyCode==112)||?//屏蔽?F1?刷新键? ??
????　(event.ctrlKey?&&?event.keyCode==82)){?//Ctrl?+?R? ??
????　event.keyCode=0;? ??
????　event.returnValue=false;? ??
??　　　alert("不准你使用快捷！");? ??
????}? ??
???if?((event.ctrlKey)&&(event.keyCode==78))?//屏蔽?Ctrl+n? ??
???{ ??
?????alert("ctrl?+?n"); ??
??　　event.returnValue=false;? ??
???} ??
????if?((event.shiftKey)&&(event.keyCode==121))?//屏蔽?shift+F10? ??
??????{ ??
??????　　alert("?shift+F10?"); ??
??????　　event.returnValue=false;? ??
???　　} ??
????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? ??
　　　　alert('Alt+F4'); ??
????//window.showModelessDialog("about:blank","","dialogWidth:1px;dialogheight:1px");? ??
????return?false; ??
}? ??
??} ??
document.onkeydown?=?KeyDown??? ??
</script>??