JS禁止刷新后退复制等

<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>