jQuery省市区街道四级联动菜单基于jquery.citys.js制作，二级、三级、四级多种联动菜单示例，扩展显示行政区划第四级(街道)信息，有调用方法，options参数等中文注释。(The four level linkage menu of jQuery province's urban street is based on jquery.citys.js production, two level, three level and four levels of multiple linkage menu examples, which extends the administrative division fourth level (street) information, has the calling method, options parameter and other Chinese annotation.)