mui-collapse-content 希望默认是展开的 要怎么写

我要用到mui-collapse-content, 形如 MUI例子中的折叠表单 ， 但我希望折叠表单默认状态是展开的，请问要怎么写呢

<div align="center">基本信息 houseInfoDiv</div>   
                            <div>  
                                <ul class="mui-table-view">  
                                    <li class="mui-table-view-cell mui-collapse">  
                                        <a class="mui-navigate-right" href="#">基本信息</a>  
                                        <div class="mui-collapse-content">  

                                                <div class="mui-input-row">  
                                                    <label>Input</label>  
                                                    <input type="text" placeholder="普通输入框">  
                                                </div>  
                                                <div class="mui-input-row">  
                                                    <label>Input</label>  
                                                    <input type="text" class="mui-input-clear" placeholder="带清除按钮的输入框">  
                                                </div>  

                                                <div class="mui-input-row">  
                                                    <label>Input</label>  
                                                    <input type="text" class="mui-input-speech mui-input-clear" placeholder="语音输入">  
                                                </div>  
                                                <div class="mui-button-row">  
                                                    <button class="mui-btn mui-btn-primary" type="button" onclick="return false;">确认</button>&nbsp;&nbsp;  
                                                    <button class="mui-btn mui-btn-primary" type="button" onclick="return false;">取消</button>  
                                                </div>  

                                        </div>  
                                    </li>  
                            </div>  
                        </div>