禁止网页刷新JS分享

<script language="Javascript"> 
//禁止右键弹出菜单 
function   document.oncontextmenu() {       
      return   false;       
}
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;     
    }     
}
//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>