[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+'
'+s);
        };
    }else{
        function addLink(){
            var body_element = document.getElementsByTagName('body')[0];
            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);},0);
        }
        document.oncopy = addLink;
    }