[转载]js复制内容加版权声明代码

转自：https://www.cnblogs.com/zdz8207/p/js-oncopy.html
 1   var ua = navigator.userAgent.toLowerCase();
 2     if( window.ActiveXObject ){
 3         document.body.oncopy = function(){
 4             event.returnValue = false;
 5             var t=document.selection.createRange().text;
 6             var s=" 原文链接："+location.href;
 7             clipboardData.setData('Text',t+'
'+s);
 8         };
 9     }else{
10         function addLink(){
11             var body_element = document.getElementsByTagName('body')[0];
12             var selection;
13             selection = window.getSelection();
14             var pagelink = " 原文链接："+location.href;
15             var copytext = selection + pagelink;
16             var newdiv = document.createElement('div');
17             newdiv.style.position='absolute';
18             newdiv.style.left='-99999px';
19             body_element.appendChild(newdiv);
20             newdiv.innerHTML = copytext;
21             selection.selectAllChildren(newdiv);
22             window.setTimeout(function(){body_element.removeChild(newdiv);},0);
23         }
24         document.oncopy = addLink;
25     }