屏蔽鼠标右键、Ctrl+N、Shift+F10、Alt+F4、F11、F5刷新、退格键

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<noscript><meta   http-equiv="refresh"   content="0;url=about:noscript"></noscript>   

<title>屏蔽鼠标右键、Ctrl+N、Shift+F10、Alt+F4、F11、F5刷新、退格键</title>   

</head>   

<body>   

<script>  

//屏蔽鼠标右键、Ctrl+N、Shift+F10、F11、F5刷新、退格键     

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;    

      }         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>   

屏蔽鼠标右键、Ctrl+N、Shift+F10、Alt+F4、F11、F5刷新、退格键   

</body>   

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