jQuery实现modal式对话框，点击弹出层的一个实例，本演示效果在点击右上角的一个小图标后，向下滑出一个评论窗口，用户在输入相关评论内容后提交表单，在网页初始打开的默认状态下，是不显示这个小窗口的。-jQuery to achieve modal type dialog, click on an instance of the pop-up layer, the effect of this presentation click on a small icon in the upper right corner, the downward slide a comment window, users enter the relevant comment after the form is submitted, the initial opening of the default page under the condition, the small window is not displayed.