javascript - 如何更改事件时的折叠颜色？

Question

我想更改折叠标题颜色(背景和字体颜色):

http://jsfiddle.net/KbQyx/

如何制作这个东西？

<div class="panel-group" id="accordion">
  <div class="panel panel-default">
    <div class="panel-heading">
      <h4 class="panel-title">
        <a  data-toggle="collapse" data-parent="#accordion" data-target="#collapseOne">
          Collapsible Group Item #1
        </a>
      </h4>
    </div>
    <div id="collapseOne" class="panel-collapse collapse in">
      <div class="panel-body">
        Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
      </div>
    </div>
  </div>

</div>

Answer 1

我假设 data-accordion 仅位于 <h4> 中标签。

这是一个可行的解决方案:jsfiddle

.panel-default > .panel-heading > .panel-title.collapsed > a{
    color: #333;
    background-color: #f5f5f5;
    border-color: #ddd;
  }


 .panel-default > .panel-heading > .panel-title:not(.collapsed) > a{
    color: #fff;
    background-color: red;
    border-color: red;
   }