er="用户名">
        </div>

        <div class="form-group has-feedback">
            <span class="mdi mdi-lock" aria-hidden="true"></span>
            <input type="password" class="form-control" id="password" placeholder="密码">
        </div>

        <div class="form-group">
            <button class="btn btn-block btn-primary" id="btnOk" type="button">立即登录</button>
        </div>
        <div class="alert alert-primary" style="text-align: center;" role="alert">
            默认
         