let's do it
選中的時候移除全部選中樣式, 然后給它自己添加選中樣式.
<ul id="midNav">
<li><a class="selected" ng-click="menuClick('teacher-info')" href="javascrpit:void(0);">簡介</a></li>
<li><a ng-click="menuClick('course-catalog')" href="javascrpit:void(0);">目錄</a></li>
<li><a ng-click="menuClick('course-note')" href="javascrpit:void(0);">筆記</a></li>
<li><a ng-click="menuClick('course-review')" href="javascrpit:void(0);">評論({{courseData.commentTime}})</a></li>
</ul>
$('#midNav li a').click(function() {
$('#midNav li a').removeClass('selected');
$(this).addClass('selected');
});