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巧妙使用border 配合blackground-orgin 来做背景定位

share
这是个普通的设计图，采用css sprite 进行切图设计
dom结构

<div class="itemShareContainer">
                <a class="share_weibo" data-type="weibo"></a>
                <a class="share_weixin" data-type="weixin"></a>
                <a class="share_qzone" data-type="qzone"></a>
                <a class="share_qq" data-type="qq"></a>
                <a class="share_qqweibo" data-type="qqweibo"></a>
                <a class="share_laiwang" data-type="laiwang"></a>
                <a class="share_mogujie" data-type="mogujie"></a>
                <a class="share_meilishuo" data-type="meilishuo"></a>
                <a class="share_douban" data-type="douban"></a>
                <a class="share_renren" data-type="renren"></a>
            </div>
    .itemShareContainer{
    a{
        display: inline-block;
        width: 80px;
        height: 80px;
        background-image:url('../img/share.png');
        background-repeat: no-repeat;
        font-size: 0px;
    }
    .share_weibo{

    }
    .share_weixin{
        background-position: 0 -80px;
    }
    .share_qzone{
        background-position: 0 -160px;
    }
    .share_qq{
        background-position: 0 -240px;
    }
    .share_qqweibo{
        background-position: 0 -320px;
    }
    .share_laiwang{
        background-position: 0 -400px;
    }
    .share_mogujie{
        background-position: 0 -480px;
    }
    .share_meilishuo{
        background-position: 0 -560px;
    }
    .share_douban{
        background-position: 0 -640px;
    }
    .share_renren{
        background-position: 0 -720px;
    }
}

现在是最基本的样式已经完成了，
问题来了，给每个a标签添加距离，跟设计图一样。
一开始我用margin来增加距离，但是用户会存在一个空点击。用户在图标的边缘点击了一下，由于采用的是margin，就有可能没有点击到a，就没有事件响应。这是就要替换掉 margin。

  • 第一种想法
    使用padding和 blackground-orgin
    blackground-orgin设置成content-box。 但是使用的css sprite ，图片是连接在一起的，padding部分也会出现了背景图片。
    这样想法不对

  • 第二种想法
    可以改变dom结构，在a标签里添加img标签，这个可以尝试下，但是总觉得改变dom不是最好的选择

  • 第三种想法
    在我即将去改变dom的时候，突然灵光一现，border可以尝试一下。

      a{
    display: inline-block;
    width: 80px;
    height: 80px;
    border: 15px solid #fff;
    background-image:url('../img/share.png');
    background-repeat: no-repeat;
    background-origin: content-box;
    font-size: 0px;
    cursor: pointer;
}

最终达到效果。

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