JavaScript给选中Navigation添加样式

let's do it

选中的时候移除全部选中样式, 然后给它自己添加选中样式.

<ul id="midNav">
    <li><a class="selected" ng-click="menuClick('teacher-info')"  href="javascrpit:void(0);">简介</a></li>
    <li><a ng-click="menuClick('course-catalog')" href="javascrpit:void(0);">目录</a></li>
    <li><a ng-click="menuClick('course-note')" href="javascrpit:void(0);">笔记</a></li>
    <li><a ng-click="menuClick('course-review')" href="javascrpit:void(0);">评论({{courseData.commentTime}})</a></li>
</ul>

    $('#midNav  li a').click(function() {
        $('#midNav li a').removeClass('selected');
        $(this).addClass('selected');
    });