在我的＆＃34;关于API＆＃34;选项卡，一旦打开模态，内容将不会显示，直到选择另一个选项卡并还原为它。我在这里缺少什么代码来解决这个问题？
<div class="tab-content">
<div role="tabpanel" class="tab-pane fade active" id="aboutTab">
<p>
<div></div>
A simple and interactive web map application created by the
technical resources team showing information regarding each
IRVM project in the state of Maryland.
</p>
<div class="panel panel-primary">
<div class="panel-heading">Web Application Features</div>
<ul class="list-group">
<li class="list-group-item">Export out drawn features for use in other
programs</li>
<li class="list-group-item">Address locator for finding specific locations
</li>
<li class="list-group-item">Measurement tool for finding length, area and
other properties</li>
<li class="list-group-item">Bookmarking for saving important sites</li>
<li class="list-group-item">
Print page option for saving out display in different
formats
</a>
</li>
<li class="list-group-item">
Layer switching between different basemaps and overlay
data
</a>
</li>
</ul>
</div>
</div>
<div role="tabpanel" class="tab-pane fade" id="contactTab">
<p>
<div></div>
This application is intended to be as informative and
user-friendly as possible. Contact us to report changes,
concerns, or other feedback.
<font color="blue">
<a
href="mailto:LResh@sha.state.md.us?subject=LOD Website Feedback -Enter Your Name-">Send an email</a>
</font>
.
</p>
</div>
<div role="tabpanel" class="tab-pane fade" id="disclaimerTab">
<p>
<div></div>
<font color="red">
The data provided on this site is for informational and
planning purposes only.
<br></br>
Absolutely no accuracy or completeness guarantee is implied
or intended. All information on this map is subject to such
variations and corrections as might result from a complete
title search and/or accurate field survey.
</font>
</p>
</div>
<div role="tabpanel" class="tab-pane fade" id="exportTab">
<p>
<div></div>
This web application exports drawn features in a geojson
format. Future updates will hopefully allow downloads into
other data types.
<br></br>
<font color="red">
<b>***</b>
Note that features created using the measuring tool will not
be extracted from export. Circular features are exported out
as their long/lat center points.
<b>***</b>
</font>
</p>
<p>
To learn more about limits/structure for .json files
<a href="https://macwright.org/2015/03/23/geojson-second-bite.html"
target="_blank">
<font color="blue"> click here
</a>
</font>
.
</font>
</p>
<p>
<b>In order to convert your .json files to .KMZ files or
another format, use </b>
<a href="http://geojson.io/#map=2/20.0/0.0" target="_blank">
<font color="blue">GeoJson.io
</a>
</font>
<b>.
</p>
</b>
</div>
</div>