< nav class="navbar navbar-default navbar-fixed-top">
< div class="container">
< div class="navbar-header">
< button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
< span class="sr-only">切换导航
< span class="icon-bar">
< span class="icon-bar">
< span class="icon-bar">
< a class="navbar-brand" href="#">品牌
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