禁止你的左键复制实用技巧

<SCRIPT LANGUAGE=javascript>
function click() {
alert(禁止你的左键复制！) }
function click1() {
if (event.button==2) {
alert(禁止右键点击'！) }}
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>