bootstrap 模态框焦点问题

Question

怎么让模态框打开就能获得焦点？

 </form>
    <div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel">
        <div class="modal-dialog" role="document">
            <div class="modal-content">
                <div class="modal-header">
                    <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
                    <h3 class="modal-title" id="exampleModalLabel" style="text-align:center"><img src="~/Images/logo.png" alt="Alternate Text" /><br /> 访客登记</h3>
                </div>
                <div class="modal-body">
                    <form>
                        <div class="form-group">
                            <label for="recipient-name" class="control-label">姓名：</label>
                            <input type="text" class="form-control" id="recipient-name" autofocus>
                        </div>
                        <div class="form-group">
                            <label for="recipient-name" class="control-label">身份证号：</label>
                            <input type="text" class="form-control" id="">
                        </div>
                        <div class="form-group">
                            <label for="recipient-name" class="control-label">工作证号：</label>
                            <input type="text" class="form-control" id="">
                        </div>
                        <div class="form-group">
                            <label for="recipient-name" class="control-label">厂商：</label>
                            <input type="text" class="form-control" id="recipient-name">
                        </div>
                    </form>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-default" data-dismiss="modal">关闭</button>
                    <button type="button" class="btn btn-primary">发送消息</button>
                </div>
            </div>
        </div>
    </div>

Answer 1

focus