分享功能可以利用插件share.js插件，也可以自己定义。只要知道各平台的分享地址及相应的参数赋值就可以了。

//第一种方法
//引入插件
<script class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="../libs/jquery/jquery/dist/jquery.share.min.js"></script>

//分享功能
$scope.sharePoster = function(platform){

    //获取需要分享的图片地址
    var posterUrl=angular.element("#myPoster").attr("src");
    if(!posterUrl){
        var layer=document.createElement("div");
        layer.id="layer";
        layer.innerHTML="请先上传图片再分享哦！"
        var style=
            {
                background:"#000000",
                color:"#ffffff",
                position:"absolute",
                zIndex:10,
                width:"484px",
                height:"62px",
                lineHeight:"61px",
                textAlign:"center",
                fontSize:"18px",
                borderRadius:"10px",
                opacity: 0.75,
                left:"38%",
                top:"45%"
            }
        for(var i in style)
            layer.style[i]=style[i];
        if(document.getElementById("layer")==null)
        {
            document.body.appendChild(layer);
            setTimeout("document.body.removeChild(layer)",2000)
        }

        return
    }

    var link = '填入当前页面路径';
    var image = posterUrl;
    var title = '好好学习天天向上';

     $('#shareposter').share({
            url: link,
            title: shareTitle,
            description: shareTitle,
            image: image,
            sites: ['weibo','qq','qzone','douban']
        });
    var shareLink = $('#shareposter').find('.icon-'+platform).attr('href');
    window.open(shareLink,'_blank');
    
}

//第二种方法

$scope.sharePoster = function(platform){

    var link = '当前页面路径';
    var image = '图片地址';
    var title = '好好学习天天向上';
    
    if (platform == "weibo") {
        window.open("http://v.t.sina.com.cn/share/share.php?url=" + link + "&title=" + title + "&content=utf8&pic=" + image);
    }

    if (platform == "qq") {
        window.open("https://connect.qq.com/widget/shareqq/index.html?url=" + link + "&title=" + title + "&pics=" + image);
   }

    if (platform == "qzone") {
        window.open("http://sns.qzone.qq.com/cgi-bin/qzshare/cgi_qzshare_onekey?url=" + link + "&title=" + title  + "&pics=" + image +"&desc=" +title);
    }
    if (platform == "douban") {
        window.open("http://www.douban.com/recommend/?url=" + link + "&title=" + title + "&image=" + image);
    }

}