<div id="bshare-custom">

<a title="分享到Tumblr" id="bshare-tumblr" onclick = "window.open('https://www.tumblr.com/widgets/share/tool?shareSource=legacy&canonicalUrl=&url=' + document.URL + '&title=' + document.title,'_target','width=600,height=500,left=300px,top=200px')">分享到Tumblr</a>

<a href="javascript:window.open('https://www.instapaper.com/user/login?next=/edit?url=' + document.URL + '&title=' + document.title,'_target','width=600,height=500,left=300px,top=200px')" title="分享到Instapaper" id="bshare-instapaper">分享到instapaper</a>

</div>

 

还可以优化，调用官方图标，这里只是简单的实现分享代码