html - 如何在网站加载时自动弹出模式

Question

        <div class="modal-dialog modal-dialog-centered">
          <div class="modal-content">

            <!-- Modal Header -->
            <div class="modal-header">
              <h4 class="modal-title">Modal Heading</h4>
              <button type="button" class="close" data-dismiss="modal">&times;</button>
            </div>

            <!-- Modal body -->
            <div class="modal-body">
              Modal body..
            </div>
           </div>
        </div>
    </div>

当用户访问我的网站时如何在网站加载时打开弹出窗口他们应该得到弹出窗口

标签： htmlcsstwitter-bootstrap