<button type="button" class="btn btn-lg btn-danger" data-toggle="popover" title="Popover title" data-content="And here's some amazing content. It's very engaging. Right?">点我弹出/隐藏弹出框</button>

$("#btn-danger").popover({
 html: true,  //实现对html可写
 title: keywords_title(), //标题函数
 content: function() {
  return keywords_content(); //内容函数
 }
});
//标题函数 
function keywords_title() {
 return '结果说明：';
}
//内容函数，同时对样式进行修改
function keywords_content() {
 var data = $('<div style="width:700px;color: #787671" ><p><span>提及结果列关键词不区分英文大小写</span></p></div>');
}
//以下是弹出框样式，可以根据需要自定义修改
.popover {
 position: absolute;
 top: 0;
 left: 0;
 z-index: 1060;
 display: none;
 max-width: 276px;
 padding: 1px;
 font-size: 14px;
 font-weight: 400;
 line-height: 1.42857143;
 text-align: left;
 white-space: normal;
 background-color: #fff;
 -webkit-background-clip: padding-box;
 background-clip: padding-box;
 border: 1px solid #ccc;
 border: 1px solid rgba(0,0,0,.2);
 border-radius: 6px;
 -webkit-box-shadow: 0 5px 10px rgba(0,0,0,.2);
 box-shadow: 0 5px 10px rgba(0,0,0,.2);
}