JavaScript实现文章复制加版权信息

　　

  function addLink() {
      var body_element = document.getElementsByTagName('body')[0];
      var selection;
  if(window.getSelection){//DOM,FF,Webkit,Chrome,IE10
  selection = window.getSelection();
  alert("文字复制成功！若有文字残缺请用右键复制
转载请注明出处："+document.location.href);

  }else if(document.getSelection){//IE10
  selection= document.getSelection();
  alert("文字复制成功！若有文字残缺请用右键复制
转载请注明出处："+document.location.href);

  }else if(document.selection){//IE6+10-
  selection= document.selection.createRange().text;
  alert("文字复制成功！若有文字残缺请用右键复制
转载请注明出处："+document.location.href);
  }else{
  selection= "";
  alert("浏览器兼容问题导致复制失败！");
  }
      var pagelink = "<br /><br /> 转载请注明来源: <a href='"+document.location.href+"'>"+document.location.href+"</a>";
      var copy_text = selection + pagelink;
      var new_div = document.createElement('div');
      new_div.style.left='-99999px';
      new_div.style.position='absolute';
      body_element.appendChild(new_div );
      new_div.innerHTML = copy_text ;
      selection.selectAllChildren(new_div );
      window.setTimeout(function() {
          body_element.removeChild(new_div );
      },0);
  }
  document.body.oncopy = addLink;