底部导航栏无法跳转怎么回事

详细问题描述
[内容]

<nav class="mui-bar mui-bar-tab">
<a class="mui-tab-item " href="http://px.junquanzhong.com/sy.html">
<span class="mui-icon mui-icon-home"></span>
<span class="mui-tab-label">首页</span>
</a>
<a class="mui-tab-item mui-active" href="http://px.junquanzhong.com/sp1j.html">
<span class="mui-icon mui-icon-bars"></span>
<span class="mui-tab-label">目录</span>
</a>
<a class="mui-tab-item" href="http://px.junquanzhong.com/geme.html">
<span class="mui-icon mui-icon-spinner-cycle mui-spin"></span>
<span class="mui-tab-label">游戏</span>
</a>
<a class="mui-tab-item" href="http://px.junquanzhong.com/me.html">
<span class="mui-icon mui-icon-contact"></span>
<span class="mui-tab-label">我</span>
</a>
</nav>

重现步骤
[步骤]
[结果]
[期望]

运行环境
[系统版本]
[浏览器版本]
[IDE版本]
[mui版本]

附件
[代码片段]
[安装包]

联系方式
[QQ]
[电话]