### 直接调用

二级联动，默认选项为：请选择

三级联动，默认省份：北京，隐藏无数据的子级select

    $("#city_1").citySelect({nodata:"none",required:false});
    $("#city_2").citySelect({prov:"北京",nodata:"none"});

### 设置省份、城市、地区（县）的默认值

二级联动

三级联动

    $("#city_3").citySelect({prov:"湖南", city:"长沙"});
    $("#city_4").citySelect({prov:"湖南", city:"长沙", dist:"岳麓区"});

### 自定义下拉选项

    $("#city_5").citySelect({
    	url:{"citylist":[
    		{"p":"前端技术","c":[{"n":"HTML"},{"n":"CSS","a":[{"s":"CSS2.0"},{"s":"CSS3.0"}]},{"n":"JAVASCIPT"}]},
    		{"p":"编程语言","c":[{"n":"C"},{"n":"C++"},{"n":"Objective-C"},{"n":"PHP"},{"n":"JAVA"}]},
    		{"p":"数据库","c":[{"n":"Mysql"},{"n":"SqlServer"},{"n":"Oracle"},{"n":"DB2"}]},
    		]},
    	prov:"",
    	city:"",
    	dist:"",
    	nodata:"none"
    });

来源：源码之家