bootstrap输入组类不起作用

Question

输入组类引导程序工作不正常下面的图像是代码输出第二个图像是期望输出输入组工作正常的跨度但是按钮它不工作

＆＃13;

＆＃13;

<!-- begin snippet: js hide: false console: true babel: false -->

<div id="Other_container" hidden>
  <div class="row">
    <div class="col-lg-4 col-lg-offset-4 col-md-4 col-md-offset-4 col-sm-4 col-sm-offset-4 col-xs-8 col-xs-offset-2">
      <div class="input-group">
        <input type="text" class="form-control" placeholder="mention your goal">
        <%--<span class="input-group-addon" style="cursor:pointer" disabled>Go!</span>--%>
          <span class="input-group-btn">
                <button class="btn btn-secondary" type="button">Go!</button>
                </span>
      </div>
    </div>
  </div>
</div>

＆＃13;

＆＃13;

＆＃13;