关于分辨率缩小时，list-group隐藏为按钮的问题解决方法

查看了例子中的源码，有个offcanvas.css和offcanvas.js需要加载。
offcanvas.css的源码：

@media screen and (max-width: 767px) {
  .row-offcanvas {
    position: relative;
    -webkit-transition: all .25s ease-out;
  -o-transition: all .25s ease-out;
     transition: all .25s ease-out;
  }
  .row-offcanvas-right {
    right: 0;
  }
  .row-offcanvas-left {
    left: 0;
  }
  .row-offcanvas-right
  .sidebar-offcanvas {
    right: -50%; 
  }
  .row-offcanvas-left
  .sidebar-offcanvas {
    left: -50%; 
  }
  .row-offcanvas-right.active {
    right: 50%; 
  }
  .row-offcanvas-left.active {
    left: 50%; 
  }
  .sidebar-offcanvas {
    position: absolute;
    top: 0;
    width: 50%; 
  }
}

offcanvas.js的源码：

$(document).ready(function () {
  $('[data-toggle="offcanvas"]').click(function () {
    $('.row-offcanvas').toggleClass('active')
  });
});

在 .html代码中加载这两个文件，样式和行为才能起效。
两个代码片段中对offcanvas的引用，button调用了data-toggle方法：

  
    
      

 Toggle
      

下面是list-group需要加载的样式