2.0版本中导航栏分蓝色调和浅色调，支持嵌套按钮，tab切换栏等其他控件。
为了兼容APICloud状态栏沉浸式的处理，当导航栏中只有中间文字或者tab等时，请不要使用.aui-title
案例代码
<header class="aui-bar aui-bar-nav">顶部导航栏</header><header class="aui-bar aui-bar-nav" style="padding-top:25px;"> <a class="aui-pull-left"> <span class="aui-iconfont aui-icon-left"></span> </a> <div class="aui-title">fixStatusBar效果</div></header><header class="aui-bar aui-bar-nav"> <a class="aui-pull-left aui-btn"> <span class="aui-iconfont aui-icon-left"></span> </a> <div class="aui-title">Title</div></header><header class="aui-bar aui-bar-nav aui-bar-light"> <a class="aui-pull-left aui-btn"> <span class="aui-iconfont aui-icon-left"></span> </a> <div class="aui-title">Title</div></header><header class="aui-bar aui-bar-nav aui-bar-light"> <a class="aui-pull-left aui-btn"> <span class="aui-iconfont aui-icon-left"></span> </a> <div class="aui-title">Title</div> <a class="aui-pull-right aui-btn aui-btn-outlined"> <span class="aui-iconfont aui-icon-search"></span> </a></header><header class="aui-bar aui-bar-nav"> <a class="aui-pull-left aui-btn"> <span class="aui-iconfont aui-icon-left"></span>返回 </a> <div class="aui-title">Title</div></header><header class="aui-bar aui-bar-nav"> <a class="aui-pull-left aui-btn aui-btn-outlined"> <span class="aui-iconfont aui-icon-menu"></span> </a> <div class="aui-title">Title</div> <a class="aui-pull-right aui-btn aui-btn-outlined"> <span class="aui-iconfont aui-icon-search"></span> </a></header>