jquery + Bootstrap : data-toggle="popover"鼠标放上去显示悬浮层 Tips

<div class="input-group-addon" style="border: 0;">
<a 
id="time_range_fa" 
href="#" 
class="fa fa-info-circle col-sm-1"                                      
style="color: #3c8dbc;font-size: 14px;" 
data-toggle="popover"
data-placement="bottom"                                      
data-trigger="hover">
</a>
</div>

$(() => {
    var tip = $('#time_range_fa');
    $(tip).popover({
        html: true,
        title: '默认查询时间：',
        delay: {show: 500, hide: 1000},
        content: function () {
            return '2017-12-01 至 2017-12-31';
        }
    });
})