JS 禁止刷新

<script language="JavaScript">
//禁止刷新，回退
function onKeyDown()
{
	if ( (event.altKey) || ((event.keyCode == 8) &&(event.srcElement.type != "text" &&event.srcElement.type != "textarea" &&event.srcElement.type != "password")) ||((event.ctrlKey) && ((event.keyCode == 78) || (event.keyCode == 82)) ) ||(event.keyCode == 116) ) 
		{
			event.keyCode = 0;
			event.returnValue = false;
		}
	}
	document.onkeydown = onKeyDown;
function stop()
	{ //这个是禁用鼠标右键
		return false;
	}
document.oncontextmenu=stop;
</script>