静态的中国省市区三级联动下拉菜单，无刷新联动-Three Chinese provinces, municipalities static linkage drop-down menu without refresh linkage

图书馆静态网页，画面精美，能够实现轮播效果和切换效果，下拉框效果，鼠标事件，可以用来参考。-Static library website, the picture is exquisite, can realize the effect of carousel and switching, drop-down box, mouse events can refer to.