header去掉边框阴影方法

              <header class="mui-bar mui-bar-nav" style="box-shadow: 0px 0px 0px #413D4A;">  
            <a class="mui-action-back mui-icon mui-icon-left-nav mui-pull-left color-e"></a>  
            <h1 class="mui-title font-size-20">基本信息</h1>  
        </header>