直接上代码
<li><a target="_blank" οnclick="javascript:window.open('http://www.facebook.com/sharer.phpu='+encodeURIComponent(location.href)+'&t='+encodeURIComponent(document.title), 'newWindow', 'width=800, height=400','center');void(0);" class="f"></a></li>
<li><a href="javascript: void(window.open('http://twitter.com/home/?status='.concat(encodeURIComponent(document.title)) .concat(' ') .concat(encodeURIComponent(location.href))));" target="_blank" rel="external nofollow" class="t"></a></li>
<li><a target="_blank" href="javascript: void(window.open('http://www.linkedin.com/shareArticle?mini=true&url='+encodeURIComponent(location.href)+'&title='+encodeURIComponent(document.title)))" target="_blank" rel="external nofollow" class="i"></a></li>
<li><a target="_blank" href="javascript: void(window.open('http://www.google.com/bookmarks/mark?op=add&bkmk='+encodeURIComponent(location.href)+'&title='+encodeURIComponent(document.title)))" target="_blank" rel="external nofollow" class="g"></a></li>