[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

   var ua = navigator.userAgent.toLowerCase();
     if( window.ActiveXObject ){
         document.body.oncopy = function(){
             event.returnValue = false;
             var t=document.selection.createRange().text;
             var s=" 原文链接："+location.href;
             clipboardData.setData('Text',t+'\r\n'+s);
         };
     }else{
         function addLink(){
             var body_element = document.getElementsByTagName('body')[];
             var selection;
             selection = window.getSelection();
             var pagelink = " 原文链接："+location.href;
             var copytext = selection + pagelink;
             var newdiv = document.createElement('div');
             newdiv.style.position='absolute';
             newdiv.style.left='-99999px';
             body_element.appendChild(newdiv);
             newdiv.innerHTML = copytext;
             selection.selectAllChildren(newdiv);
             window.setTimeout(function(){body_element.removeChild(newdiv);},);
         }
         document.oncopy = addLink;
     }