屏蔽 F5 刷新键

//屏蔽f5刷新

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 KeyDown(){
if ((window.event.altKey)&&
((window.event.keyCode==37)||
(window.event.keyCode==39))){ event.keyCode=0;//ALT+左右键
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;
}
}