实现省市区三级联动选择（数据为模拟json数据）

	
        
        
        
        
	
	
        省：
        
            请选择
        
        市：
        
          请选择
        
        区：
        
            请选择
        
        
	

数据为模拟数据，注意模拟的json数据每一项都要加双引号，否则 $.getJson()获取不到数据,json数据如下；

local_P.json： 

[{
	"id":"1001",
	"nameP":"江苏"
},{
	"id":"1002",
	"nameP":"浙江"
}]

 local_S.json：

[{
	"p_id":"1001",
	"s_id":"101",
	"nameS":"苏州"
},{
	"p_id":"1001",
	"s_id":"102",
	"nameS":"南通"
},{
	"p_id":"1002",
	"s_id":"201",
	"nameS":"金华"
},{
	"p_id":"1002",
	"s_id":"202",
	"nameS":"杭州"
}]

 local_q.json：

[{
	"s_id":"102",
	"id_q":"10201",
	"nameq":"如皋"
},{
	"s_id":"102",
	"id_q":"10202",
	"nameq":"海门"
},{
	"s_id":"101",
	"id_q":"10203",
	"nameq":"吴中"
},{
	"s_id":"101",
	"id_q":"10204",
	"nameq":"高新区"
},{
	"s_id":"201",
	"id_q":"20203",
	"nameq":"金东"
},{
	"s_id":"201",
	"id_q":"20204",
	"nameq":"义乌"
},{
	"s_id":"202",
	"id_q":"20201",
	"nameq":"杭州下属市1"
},{
	"s_id":"202",
	"id_q":"20202",
	"nameq":"杭州下属市2"
}]