B/S模式下如何使软件屏蔽系统热键

publicvoidHideAllFunction(Pagepage)   {   if(!

public void HideAllFunction(Page page) 

  {

   if(!page.IsStartupScriptRegistered ("msgHideAllFunction"))

   {

    string clientScript=@"<script language=JavaScript>

          function KeyDown(){   

            if ((window.event.altKey)&& ((window.event.keyCode==37)||(window.event.keyCode==39)))  //屏蔽 Alt+ 方向键 ←  //屏蔽 Alt+ 方向键 →

            {

             event.returnValue=false;

            }

            if (event.keyCode==116) //屏蔽 F5 刷新键

            {         

             event.keyCode=0;

             event.returnValue=false;

            }

            if ((event.ctrlKey)&&(event.keyCode==78))//屏蔽 Ctrl+n

            {  

             event.returnValue=false;

            }  

            if ((event.shiftKey)&&(event.keyCode==121))//屏蔽 shift+F10

            {

             event.returnValue=false;

            }

            if (event.keyCode==122)//屏蔽 F11

            {

             event.keyCode=0;

             event.returnValue=false;

            }

           }

           function nocontextmenu()             {             event.cancelBubble = true             event.returnValue = false;

            return false;             }           document.onkeydown = KeyDown;           document.οncοntextmenu=nocontextmenu;          </script>";

    page.RegisterStartupScript("msgHideAllFunction",clientScript);    }

  }

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