<span style="font-size:24px;"><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script language=javascript>
function click() {
alert('禁止左键复制！') }
function click1() {
if (event.button==2) {
alert('禁止右键复制！') }}
function CtrlKeyDown(){
if (event.ctrlKey) {
alert('不当的拷贝将损害您的系统！') }}
document.onkeydown=CtrlKeyDown;
document.onselectstart=click;
document.onmousedown=click1;
</script>
</script>
</head>
<body>
this is test !
</body>
</html></span>