网页防拷贝javascript代码

<script type="text/javascript" language="javascript">document.body.oncopy=function(){event.returnValue=false;var t=document.selection.createRange().text;var s1="来源：吉林网(http://www.baijinshan.cn)";var s2="来自：吉林网(http://www.baijinshan.cn)";var y1 = "："; var t1 = t.replace(y1,"：(选自吉林网)"); var y2 = "。"; var ta = t1.replace(y2,"。(来自吉林网)"); //sa=clipboardData.setData("Text",ta+'\r\n'+s2); sa=clipboardData.setData("Text",'\r\n'+s2); } </script>