javascript 屏蔽F5，BackSpace，IE的刷新，右键功能
function DisableF5(){ with (event){ // F5 and Ctrl+R if (keyCode==116 || (ctrlKey && keyCode==82)){ event.keyCode = 0; event.cancelBubble = true; return false; } } } document.onkeydown = DisableF5; function document.onkeydown() { 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; } } document.onkeydown=function(){ if ((window.event.keyCode==116)|| //屏蔽 F5 (window.event.keyCode==122)|| //屏蔽 F11 (window.event.shiftKey && window.event.keyCode==121) //shift+F10 ) { window.event.keyCode=0; window.event.returnValue=false; } if ((window.event.altKey)&&(window.event.keyCode==115)) { //屏蔽Alt+F4 window.showModelessDialog("about:blank","","dialogWidth:1px;dialogheight:1px"); return false; } }if (window.Event) document.captureEvents(Event.MOUSEUP); function nocontextmenu(){ event.cancelBubble = true event.returnValue = false; return false; } function norightclick(e){ if (window.Event){ if (e.which == 2 || e.which == 3) return false; } else if (event.button == 2 || event.button == 3){ event.cancelBubble = true event.returnValue = false; return false; } } document.oncontextmenu = nocontextmenu; // for IE5+ document.onmousedown = norightclick; // for all others