网页屏蔽各种按键的代码分享

<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>