因為他們有空白字符（是因為代碼換行產(chǎn)生的）

解決方案有很多?

<div?class="btn-grounp"?style="font-size:0">
????<button?class="btn?btn-info"?type="button">
????????<span?class="glyphicon?glyphicon-fast-forward"></span>
????</button>
????<button?class="btn?btn-info"?type="button">
????????<span?class="glyphicon?glyphicon-backward"></span>
????</button>
</div>

<div?class="btn-grounp">
????<button?class="btn?btn-info"?type="button">
????????<span?class="glyphicon?glyphicon-fast-forward"></span>
????</button><button?class="btn?btn-info"?type="button">
????????<span?class="glyphicon?glyphicon-backward"></span>
????</button>
</div>

上面兩種方法都可以，第一種是設他們父級的字體大小為0，第二種是兩個button的html代碼不要換行