一个三级无刷新下拉菜单，调用省市级数据，所有的数据都保存到mysql数据库，里面直接跟Mysql数据库相连接，将数据库导入，即可直接运行，其实有这个实例后，我们完全可以做成其他应用，举一反三，比如做成新闻的三级分类都是不错的。

提示一点，如果要进行整合到已成型的网站上去，只需要将数据表导入就可以了，适当修改一下数据库的连接代码，调用的代码不变。-After a three-no-refresh drop-down menu, call the provincial and municipal data, all data is saved to the mysql , which is connected directly with the Mysql , the　import, can be run directly, in fact, there is this example, we can do into other applications, giving top priority to make the news of three such classification are good. Tip point, if you want to be integrated into the site has been molded up, simply import the data table can be, appropriately modify the　connection code, the code calls the same.