function click() { 
alert('请勿复制资料!') } 
function click1() { 
if (event.button==2) {alert('请勿复制资料!') }} 
function CtrlKeyDown(){ 
if (event.ctrlKey) {alert('请勿复制资料!') }} 
document.onkeydown=CtrlKeyDown; 
document.onselectstart=click; 
document.onmousedown=click1; 



function onKeyDown()
{
	if ((event.keyCode==116)||(window.event.ctrlKey)||(window.event.shiftKey)||(event.keyCode==122))
	{
	event.keyCode=0;
	event.returnValue=false;
	}
}


function yxl() { 
if(window.event.altKey) 
{
window.event.returnValue=false;
}
}
document.onkeydown=yxl