lock__body">
            <div class="form-group form-group--float">
                <input v-model="username" type="text" class="form-control" placeholder="用户名">
                <i class="form-group__bar"></i>
            </div>

            <div class="form-group form-group--float">
                <input v-model="password" type="password" class="form-control" placeholder="密码">
                <i class="form-group__bar"></i>
            </div>

            <div class="form-group form-group--float